656216657 has 4 divisors (see below), whose sum is σ = 684747840. Its totient is φ = 627685476.

The previous prime is 656216633. The next prime is 656216681. The reversal of 656216657 is 756612656.

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 an interprime number because it is at equal distance from previous prime (656216633) and next prime (656216681).

It is a cyclic number.

It is not a de Polignac number, because 656216657 - 2¹⁴ = 656200273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656216257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14265557 + ... + 14265602.

It is an arithmetic number, because the mean of its divisors is an integer number (171186960).

Almost surely, 2^656216657 is an apocalyptic number.

It is an amenable number.

656216657 is a deficient number, since it is larger than the sum of its proper divisors (28531183).

656216657 is a wasteful number, since it uses less digits than its factorization.

656216657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28531182.

The product of its digits is 453600, while the sum is 44.

The square root of 656216657 is about 25616.7261179098. The cubic root of 656216657 is about 868.9919433652.

The spelling of 656216657 in words is "six hundred fifty-six million, two hundred sixteen thousand, six hundred fifty-seven".