851615660 has 48 divisors (see below), whose sum is σ = 2082459456. Its totient is φ = 286470912.

The previous prime is 851615621. The next prime is 851615707. The reversal of 851615660 is 66516158.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49967 + ... + 64806.

It is an arithmetic number, because the mean of its divisors is an integer number (43384572).

Almost surely, 2^851615660 is an apocalyptic number.

It is an amenable number.

851615660 is an abundant number, since it is smaller than the sum of its proper divisors (1230843796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

851615660 is a wasteful number, since it uses less digits than its factorization.

851615660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114842 (or 114840 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 851615660 is about 29182.4546602920. The cubic root of 851615660 is about 947.8680390421.

The spelling of 851615660 in words is "eight hundred fifty-one million, six hundred fifteen thousand, six hundred sixty".