1165489274880 has 1904 divisors, whose sum is σ = 5198640761664. Its totient is φ = 244611809280.

The previous prime is 1165489274843. The next prime is 1165489274899. The reversal of 1165489274880 is 884729845611.

1165489274880 is a `hidden beast` number, since 1 + 1 + 6 + 5 + 489 + 2 + 74 + 8 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (1904).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 28426567660 + ... + 28426567700.

Almost surely, 2^{1165489274880} is an apocalyptic number.

1165489274880 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 1165489274880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2599320380832).

1165489274880 is an abundant number, since it is smaller than the sum of its proper divisors (4033151486784).

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

1165489274880 is an frugal number, since it uses more digits than its factorization.

1165489274880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120 (or 75 counting only the distinct ones).

The product of its (nonzero) digits is 30965760, while the sum is 63.

The spelling of 1165489274880 in words is "one trillion, one hundred sixty-five billion, four hundred eighty-nine million, two hundred seventy-four thousand, eight hundred eighty".