666262431 has 6 divisors (see below), whose sum is σ = 962379080. Its totient is φ = 444174948.

The previous prime is 666262427. The next prime is 666262469. The reversal of 666262431 is 134262666.

It is not a de Polignac number, because 666262431 - 2² = 666262427 is a prime.

It is a super-2 number, since 2×666262431² = 887811253924059522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666262931) 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, 37014571 + ... + 37014588.

Almost surely, 2^666262431 is an apocalyptic number.

666262431 is a deficient number, since it is larger than the sum of its proper divisors (296116649).

666262431 is a wasteful number, since it uses less digits than its factorization.

666262431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74029165 (or 74029162 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 666262431 is about 25812.0597976992. The cubic root of 666262431 is about 873.4038628463.

The spelling of 666262431 in words is "six hundred sixty-six million, two hundred sixty-two thousand, four hundred thirty-one".