667245631 has 24 divisors (see below), whose sum is σ = 768740544. Its totient is φ = 576875520.

The previous prime is 667245619. The next prime is 667245641. The reversal of 667245631 is 136542766.

It is not a de Polignac number, because 667245631 - 2⁷ = 667245503 is a prime.

It is a super-2 number, since 2×667245631² = 890433464177176322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667245641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 778155 + ... + 779011.

It is an arithmetic number, because the mean of its divisors is an integer number (32030856).

Almost surely, 2^667245631 is an apocalyptic number.

667245631 is a deficient number, since it is larger than the sum of its proper divisors (101494913).

667245631 is a wasteful number, since it uses less digits than its factorization.

667245631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1171 (or 1158 counting only the distinct ones).

The product of its digits is 181440, while the sum is 40.

The square root of 667245631 is about 25831.0981377099. The cubic root of 667245631 is about 873.8332775313.

The spelling of 667245631 in words is "six hundred sixty-seven million, two hundred forty-five thousand, six hundred thirty-one".