155656557 has 12 divisors (see below), whose sum is σ = 256956960. Its totient is φ = 88946568.

The previous prime is 155656547. The next prime is 155656583. The reversal of 155656557 is 755656551.

It is not a de Polignac number, because 155656557 - 2⁷ = 155656429 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155656547) 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 11 ways as a sum of consecutive naturals, for example, 1235307 + ... + 1235432.

It is an arithmetic number, because the mean of its divisors is an integer number (21413080).

Almost surely, 2^155656557 is an apocalyptic number.

It is an amenable number.

155656557 is a deficient number, since it is larger than the sum of its proper divisors (101300403).

155656557 is a wasteful number, since it uses less digits than its factorization.

155656557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2470752 (or 2470749 counting only the distinct ones).

The product of its digits is 787500, while the sum is 45.

The square root of 155656557 is about 12476.2396979218. The cubic root of 155656557 is about 537.9259225085.

It can be divided in two parts, 15565 and 6557, that added together give a palindrome (22122).

The spelling of 155656557 in words is "one hundred fifty-five million, six hundred fifty-six thousand, five hundred fifty-seven".