667668718 has 8 divisors (see below), whose sum is σ = 1009389312. Its totient is φ = 331205616.

The previous prime is 667668713. The next prime is 667668733. The reversal of 667668718 is 817866766.

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

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 1314055 + ... + 1314562.

It is an arithmetic number, because the mean of its divisors is an integer number (126173664).

Almost surely, 2^667668718 is an apocalyptic number.

667668718 is a deficient number, since it is larger than the sum of its proper divisors (341720594).

667668718 is a wasteful number, since it uses less digits than its factorization.

667668718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2628746.

The product of its digits is 4064256, while the sum is 55.

The square root of 667668718 is about 25839.2863291539. The cubic root of 667668718 is about 874.0179318619.

The spelling of 667668718 in words is "six hundred sixty-seven million, six hundred sixty-eight thousand, seven hundred eighteen".