155642556 has 24 divisors (see below), whose sum is σ = 370019664. Its totient is φ = 50901760.

The previous prime is 155642551. The next prime is 155642563. The reversal of 155642556 is 655246551.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155642551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121725 + ... + 122996.

It is an arithmetic number, because the mean of its divisors is an integer number (15417486).

Almost surely, 2^155642556 is an apocalyptic number.

It is an amenable number.

155642556 is an abundant number, since it is smaller than the sum of its proper divisors (214377108).

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

155642556 is a wasteful number, since it uses less digits than its factorization.

155642556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244781 (or 244779 counting only the distinct ones).

The product of its digits is 180000, while the sum is 39.

The square root of 155642556 is about 12475.6785787387. The cubic root of 155642556 is about 537.9097935666.

The spelling of 155642556 in words is "one hundred fifty-five million, six hundred forty-two thousand, five hundred fifty-six".