155921794560 has 960 divisors, whose sum is σ = 678460147200. Its totient is φ = 33749581824.

The previous prime is 155921794549. The next prime is 155921794583. The reversal of 155921794560 is 65497129551.

155921794560 is a `hidden beast` number, since 1 + 5 + 5 + 9 + 2 + 1 + 79 + 4 + 560 = 666.

It is a tau number, because it is divible by the number of its divisors (960).

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 = 155921794497 and 155921794506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 64349509 + ... + 64351931.

It is an arithmetic number, because the mean of its divisors is an integer number (706729320).

Almost surely, 2^155921794560 is an apocalyptic number.

155921794560 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 155921794560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (339230073600).

155921794560 is an abundant number, since it is smaller than the sum of its proper divisors (522538352640).

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

155921794560 is a wasteful number, since it uses less digits than its factorization.

155921794560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2488 (or 2459 counting only the distinct ones).

The product of its (nonzero) digits is 3402000, while the sum is 54.

The spelling of 155921794560 in words is "one hundred fifty-five billion, nine hundred twenty-one million, seven hundred ninety-four thousand, five hundred sixty".