855915657 has 8 divisors (see below), whose sum is σ = 1180573440. Its totient is φ = 550934160.

The previous prime is 855915607. The next prime is 855915659. The reversal of 855915657 is 756519558.

It is a happy number.

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

It is not a de Polignac number, because 855915657 - 2¹² = 855911561 is a prime.

It is a super-2 number, since 2×855915657² = 1465183223795483298, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (855915659) 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, 4918969 + ... + 4919142.

It is an arithmetic number, because the mean of its divisors is an integer number (147571680).

Almost surely, 2^855915657 is an apocalyptic number.

855915657 is a gapful number since it is divisible by the number (87) formed by its first and last digit.

It is an amenable number.

855915657 is a deficient number, since it is larger than the sum of its proper divisors (324657783).

855915657 is a wasteful number, since it uses less digits than its factorization.

855915657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9838143.

The product of its digits is 1890000, while the sum is 51.

The square root of 855915657 is about 29256.0362489521. The cubic root of 855915657 is about 949.4606937140.

The spelling of 855915657 in words is "eight hundred fifty-five million, nine hundred fifteen thousand, six hundred fifty-seven".