667668715 has 16 divisors (see below), whose sum is σ = 916097472. Its totient is φ = 457611264.

The previous prime is 667668713. The next prime is 667668733. The reversal of 667668715 is 517866766.

It is a cyclic number.

It is not a de Polignac number, because 667668715 - 2¹ = 667668713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667668713) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111067 + ... + 116923.

It is an arithmetic number, because the mean of its divisors is an integer number (57256092).

Almost surely, 2^667668715 is an apocalyptic number.

667668715 is a deficient number, since it is larger than the sum of its proper divisors (248428757).

667668715 is a wasteful number, since it uses less digits than its factorization.

667668715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9126.

The product of its digits is 2540160, while the sum is 52.

The square root of 667668715 is about 25839.2862711028. The cubic root of 667668715 is about 874.0179305529.

The spelling of 667668715 in words is "six hundred sixty-seven million, six hundred sixty-eight thousand, seven hundred fifteen".