666581932 has 6 divisors (see below), whose sum is σ = 1166518388. Its totient is φ = 333290964.

The previous prime is 666581897. The next prime is 666581939. The reversal of 666581932 is 239185666.

It is not an unprimeable number, because it can be changed into a prime (666581939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83322738 + ... + 83322745.

Almost surely, 2^666581932 is an apocalyptic number.

It is an amenable number.

666581932 is a deficient number, since it is larger than the sum of its proper divisors (499936456).

666581932 is a wasteful number, since it uses less digits than its factorization.

666581932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166645487 (or 166645485 counting only the distinct ones).

The product of its digits is 466560, while the sum is 46.

The square root of 666581932 is about 25818.2480428088. The cubic root of 666581932 is about 873.5434518934.

The spelling of 666581932 in words is "six hundred sixty-six million, five hundred eighty-one thousand, nine hundred thirty-two".