667907715 has 8 divisors (see below), whose sum is σ = 1068652368. Its totient is φ = 356217440.

The previous prime is 667907711. The next prime is 667907717. The reversal of 667907715 is 517709766.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 667907715 - 2² = 667907711 is a prime.

It is a super-2 number, since 2×667907715² = 892201431513042450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (667907711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22263576 + ... + 22263605.

It is an arithmetic number, because the mean of its divisors is an integer number (133581546).

Almost surely, 2^667907715 is an apocalyptic number.

667907715 is a deficient number, since it is larger than the sum of its proper divisors (400744653).

667907715 is a wasteful number, since it uses less digits than its factorization.

667907715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44527189.

The product of its (nonzero) digits is 555660, while the sum is 48.

The square root of 667907715 is about 25843.9105980500. The cubic root of 667907715 is about 874.1222065013.

The spelling of 667907715 in words is "six hundred sixty-seven million, nine hundred seven thousand, seven hundred fifteen".