665677672 has 32 divisors (see below), whose sum is σ = 1371434400. Its totient is φ = 300398400.

The previous prime is 665677643. The next prime is 665677697. The reversal of 665677672 is 276776566.

It is a happy 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, 14979 + ... + 39442.

It is an arithmetic number, because the mean of its divisors is an integer number (42857325).

Almost surely, 2^665677672 is an apocalyptic number.

It is an amenable number.

665677672 is an abundant number, since it is smaller than the sum of its proper divisors (705756728).

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

665677672 is a wasteful number, since it uses less digits than its factorization.

665677672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54577 (or 54573 counting only the distinct ones).

The product of its digits is 4445280, while the sum is 52.

The square root of 665677672 is about 25800.7300671900. The cubic root of 665677672 is about 873.1482677353.

The spelling of 665677672 in words is "six hundred sixty-five million, six hundred seventy-seven thousand, six hundred seventy-two".