155821158920 has 32 divisors (see below), whose sum is σ = 400682980800. Its totient is φ = 53424397248.

The previous prime is 155821158881. The next prime is 155821158943. The reversal of 155821158920 is 29851128551.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278251790 + ... + 278252349.

It is an arithmetic number, because the mean of its divisors is an integer number (12521343150).

Almost surely, 2^155821158920 is an apocalyptic number.

155821158920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155821158920 is an abundant number, since it is smaller than the sum of its proper divisors (244861821880).

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

155821158920 is a wasteful number, since it uses less digits than its factorization.

155821158920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556504157 (or 556504153 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 47.

The spelling of 155821158920 in words is "one hundred fifty-five billion, eight hundred twenty-one million, one hundred fifty-eight thousand, nine hundred twenty".