665471960 has 32 divisors (see below), whose sum is σ = 1576119600. Its totient is φ = 252178560.

The previous prime is 665471951. The next prime is 665471971. The reversal of 665471960 is 69174566.

It is a happy number.

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, 437051 + ... + 438570.

Almost surely, 2^665471960 is an apocalyptic number.

It is an amenable number.

665471960 is an abundant number, since it is smaller than the sum of its proper divisors (910647640).

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

665471960 is a wasteful number, since it uses less digits than its factorization.

665471960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875651 (or 875647 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 665471960 is about 25796.7432052963. The cubic root of 665471960 is about 873.0583165024.

The spelling of 665471960 in words is "six hundred sixty-five million, four hundred seventy-one thousand, nine hundred sixty".