66665232 has 30 divisors (see below), whose sum is σ = 186570462. Its totient is φ = 22221696.

The previous prime is 66665227. The next prime is 66665233. The reversal of 66665232 is 23256666.

It can be written as a sum of positive squares in only one way, i.e., 65999376 + 665856 = 8124^2 + 816^2 .

It is a super-2 number, since 2×66665232² = 8888506315227648, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (66665233) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 231333 + ... + 231620.

Almost surely, 2^66665232 is an apocalyptic number.

It is an amenable number.

66665232 is an abundant number, since it is smaller than the sum of its proper divisors (119905230).

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

66665232 is a wasteful number, since it uses less digits than its factorization.

66665232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462967 (or 462958 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 66665232 is about 8164.8779537725. The cubic root of 66665232 is about 405.4772243732.

The spelling of 66665232 in words is "sixty-six million, six hundred sixty-five thousand, two hundred thirty-two".