1209979330560 has 1792 divisors, whose sum is σ = 5781243525120. Its totient is φ = 231871610880.

The previous prime is 1209979330543. The next prime is 1209979330577. The reversal of 1209979330560 is 650339799021.

It is a happy number.

1209979330560 is a `hidden beast` number, since 1 + 2 + 0 + 9 + 9 + 79 + 3 + 3 + 0 + 560 = 666.

It is an interprime number because it is at equal distance from previous prime (1209979330543) and next prime (1209979330577).

It is a tau number, because it is divible by the number of its divisors (1792).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 1209979330497 and 1209979330506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1107025374 + ... + 1107026466.

It is an arithmetic number, because the mean of its divisors is an integer number (3226140360).

Almost surely, 2^{1209979330560} is an apocalyptic number.

1209979330560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1209979330560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2890621762560).

1209979330560 is an abundant number, since it is smaller than the sum of its proper divisors (4571264194560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1209979330560 is a wasteful number, since it uses less digits than its factorization.

1209979330560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164 (or 1134 counting only the distinct ones).

The product of its (nonzero) digits is 2755620, while the sum is 54.

The spelling of 1209979330560 in words is "one trillion, two hundred nine billion, nine hundred seventy-nine million, three hundred thirty thousand, five hundred sixty".