667650657 has 4 divisors (see below), whose sum is σ = 890200880. Its totient is φ = 445100436.

The previous prime is 667650653. The next prime is 667650679. The reversal of 667650657 is 756056766.

667650657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 667650657 - 2² = 667650653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667650653) 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, 111275107 + ... + 111275112.

It is an arithmetic number, because the mean of its divisors is an integer number (222550220).

Almost surely, 2^667650657 is an apocalyptic number.

It is an amenable number.

667650657 is a deficient number, since it is larger than the sum of its proper divisors (222550223).

667650657 is a wasteful number, since it uses less digits than its factorization.

667650657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222550222.

The product of its (nonzero) digits is 1587600, while the sum is 48.

The square root of 667650657 is about 25838.9368395838. The cubic root of 667650657 is about 874.0100508176.

The spelling of 667650657 in words is "six hundred sixty-seven million, six hundred fifty thousand, six hundred fifty-seven".