665981310 has 16 divisors (see below), whose sum is σ = 1598355216. Its totient is φ = 177595008.

The previous prime is 665981299. The next prime is 665981333. The reversal of 665981310 is 13189566.

It is a super-2 number, since 2×665981310² = 887062210538632200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11099659 + ... + 11099718.

It is an arithmetic number, because the mean of its divisors is an integer number (99897201).

Almost surely, 2^665981310 is an apocalyptic number.

665981310 is an abundant number, since it is smaller than the sum of its proper divisors (932373906).

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

665981310 is a wasteful number, since it uses less digits than its factorization.

665981310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22199387.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 665981310 is about 25806.6136871927. The cubic root of 665981310 is about 873.2810049968.

The spelling of 665981310 in words is "six hundred sixty-five million, nine hundred eighty-one thousand, three hundred ten".