665531632 has 10 divisors (see below), whose sum is σ = 1289467568. Its totient is φ = 332765808.

The previous prime is 665531593. The next prime is 665531641. The reversal of 665531632 is 236135566.

It is a junction number, because it is equal to n+sod(n) for n = 665531591 and 665531600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20797848 + ... + 20797879.

Almost surely, 2^665531632 is an apocalyptic number.

It is an amenable number.

665531632 is a deficient number, since it is larger than the sum of its proper divisors (623935936).

665531632 is a wasteful number, since it uses less digits than its factorization.

665531632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41595735 (or 41595729 counting only the distinct ones).

The product of its digits is 97200, while the sum is 37.

The square root of 665531632 is about 25797.8997594765. The cubic root of 665531632 is about 873.0844110548.

The spelling of 665531632 in words is "six hundred sixty-five million, five hundred thirty-one thousand, six hundred thirty-two".