667142631 has 12 divisors (see below), whose sum is σ = 963969552. Its totient is φ = 444614496.

The previous prime is 667142627. The next prime is 667142647. The reversal of 667142631 is 136241766.

It is a happy number.

667142631 is a `hidden beast` number, since 6 + 6 + 7 + 14 + 2 + 631 = 666.

It is not a de Polignac number, because 667142631 - 2² = 667142627 is a prime.

It is a super-2 number, since 2×667142631² = 890158580195204322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667142681) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21235 + ... + 42251.

It is an arithmetic number, because the mean of its divisors is an integer number (80330796).

Almost surely, 2^667142631 is an apocalyptic number.

667142631 is a deficient number, since it is larger than the sum of its proper divisors (296826921).

667142631 is a wasteful number, since it uses less digits than its factorization.

667142631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24550 (or 24547 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 667142631 is about 25829.1043398721. The cubic root of 667142631 is about 873.7883118520.

The spelling of 667142631 in words is "six hundred sixty-seven million, one hundred forty-two thousand, six hundred thirty-one".