1123721890560 has 972 divisors, whose sum is σ = 4298013134688. Its totient is φ = 281423020032.

The previous prime is 1123721890531. The next prime is 1123721890607. The reversal of 1123721890560 is 650981273211.

1123721890560 is a `hidden beast` number, since 1 + 1 + 2 + 3 + 7 + 2 + 1 + 89 + 0 + 560 = 666.

It is a tau number, because it is divible by the number of its divisors (972).

It is a super-2 number, since 2×1123721890560² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 2427044889 + ... + 2427045351.

Almost surely, 2^{1123721890560} is an apocalyptic number.

1123721890560 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 1123721890560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2149006567344).

1123721890560 is an abundant number, since it is smaller than the sum of its proper divisors (3174291244128).

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

1123721890560 is an frugal number, since it uses more digits than its factorization.

1123721890560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542 (or 490 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The spelling of 1123721890560 in words is "one trillion, one hundred twenty-three billion, seven hundred twenty-one million, eight hundred ninety thousand, five hundred sixty".