656740967 has 4 divisors (see below), whose sum is σ = 669132360. Its totient is φ = 644349576.

The previous prime is 656740949. The next prime is 656740969. The reversal of 656740967 is 769047656.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 656740967 - 2¹⁰ = 656739943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656740969) 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, 6195617 + ... + 6195722.

It is an arithmetic number, because the mean of its divisors is an integer number (167283090).

Almost surely, 2^656740967 is an apocalyptic number.

656740967 is a deficient number, since it is larger than the sum of its proper divisors (12391393).

656740967 is a wasteful number, since it uses less digits than its factorization.

656740967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12391392.

The product of its (nonzero) digits is 1905120, while the sum is 50.

The square root of 656740967 is about 25626.9578178917. The cubic root of 656740967 is about 869.2233201365.

The spelling of 656740967 in words is "six hundred fifty-six million, seven hundred forty thousand, nine hundred sixty-seven".