155630657 has 16 divisors (see below), whose sum is σ = 191869440. Its totient is φ = 122928192.

The previous prime is 155630647. The next prime is 155630669. The reversal of 155630657 is 756036551.

It is a cyclic number.

It is not a de Polignac number, because 155630657 - 2⁶ = 155630593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155630657.

It is not an unprimeable number, because it can be changed into a prime (155630647) 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, 74408 + ... + 76470.

It is an arithmetic number, because the mean of its divisors is an integer number (11991840).

Almost surely, 2^155630657 is an apocalyptic number.

It is an amenable number.

155630657 is a deficient number, since it is larger than the sum of its proper divisors (36238783).

155630657 is a wasteful number, since it uses less digits than its factorization.

155630657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2912.

The product of its (nonzero) digits is 94500, while the sum is 38.

The square root of 155630657 is about 12475.2016817365. The cubic root of 155630657 is about 537.8960853369.

The spelling of 155630657 in words is "one hundred fifty-five million, six hundred thirty thousand, six hundred fifty-seven".