661315852 has 12 divisors (see below), whose sum is σ = 1165629640. Its totient is φ = 328278816.

The previous prime is 661315847. The next prime is 661315859. The reversal of 661315852 is 258513166.

It is a super-2 number, since 2×661315852² = 874677312212971808, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (661315859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 594153 + ... + 595264.

Almost surely, 2^661315852 is an apocalyptic number.

It is an amenable number.

661315852 is a deficient number, since it is larger than the sum of its proper divisors (504313788).

661315852 is a wasteful number, since it uses less digits than its factorization.

661315852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189560 (or 1189558 counting only the distinct ones).

The product of its digits is 43200, while the sum is 37.

The square root of 661315852 is about 25716.0621402267. The cubic root of 661315852 is about 871.2370002047.

The spelling of 661315852 in words is "six hundred sixty-one million, three hundred fifteen thousand, eight hundred fifty-two".