155655972 has 24 divisors (see below), whose sum is σ = 403552800. Its totient is φ = 51885288.

The previous prime is 155655971. The next prime is 155655989. The reversal of 155655972 is 279556551.

155655972 is a `hidden beast` number, since 1 + 5 + 56 + 5 + 597 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (155655971) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 720522 + ... + 720737.

It is an arithmetic number, because the mean of its divisors is an integer number (16814700).

Almost surely, 2^155655972 is an apocalyptic number.

155655972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

155655972 is an abundant number, since it is smaller than the sum of its proper divisors (247896828).

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

155655972 is a wasteful number, since it uses less digits than its factorization.

155655972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1441272 (or 1441264 counting only the distinct ones).

The product of its digits is 472500, while the sum is 45.

The square root of 155655972 is about 12476.2162533358. The cubic root of 155655972 is about 537.9252486166.

The spelling of 155655972 in words is "one hundred fifty-five million, six hundred fifty-five thousand, nine hundred seventy-two".