155057257 has 8 divisors (see below), whose sum is σ = 160658432. Its totient is φ = 149493600.

The previous prime is 155057239. The next prime is 155057261. The reversal of 155057257 is 752750551.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155057257 - 2⁷ = 155057129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155057207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 828 + ... + 17629.

It is an arithmetic number, because the mean of its divisors is an integer number (20082304).

Almost surely, 2^155057257 is an apocalyptic number.

It is an amenable number.

155057257 is a deficient number, since it is larger than the sum of its proper divisors (5601175).

155057257 is a wasteful number, since it uses less digits than its factorization.

155057257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18759.

The product of its (nonzero) digits is 61250, while the sum is 37.

The square root of 155057257 is about 12452.1988821252. The cubic root of 155057257 is about 537.2346707040.

The spelling of 155057257 in words is "one hundred fifty-five million, fifty-seven thousand, two hundred fifty-seven".