155551557 has 16 divisors (see below), whose sum is σ = 240371712. Its totient is φ = 87633840.

The previous prime is 155551549. The next prime is 155551577. The reversal of 155551557 is 755155551.

It is not a de Polignac number, because 155551557 - 2³ = 155551549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155551577) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50673 + ... + 53654.

It is an arithmetic number, because the mean of its divisors is an integer number (15023232).

Almost surely, 2^155551557 is an apocalyptic number.

It is an amenable number.

155551557 is a deficient number, since it is larger than the sum of its proper divisors (84820155).

155551557 is a wasteful number, since it uses less digits than its factorization.

155551557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104408.

The product of its digits is 109375, while the sum is 39.

The square root of 155551557 is about 12472.0309893778. The cubic root of 155551557 is about 537.8049405039.

The spelling of 155551557 in words is "one hundred fifty-five million, five hundred fifty-one thousand, five hundred fifty-seven".