656990895 has 16 divisors (see below), whose sum is σ = 1146748032. Its totient is φ = 318540960.

The previous prime is 656990881. The next prime is 656990909. The reversal of 656990895 is 598099656.

It is an interprime number because it is at equal distance from previous prime (656990881) and next prime (656990909).

It is not a de Polignac number, because 656990895 - 2⁴ = 656990879 is a prime.

It is a super-2 number, since 2×656990895² = 863274072225802050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1990717 + ... + 1991046.

It is an arithmetic number, because the mean of its divisors is an integer number (71671752).

Almost surely, 2^656990895 is an apocalyptic number.

656990895 is a deficient number, since it is larger than the sum of its proper divisors (489757137).

656990895 is a wasteful number, since it uses less digits than its factorization.

656990895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3981782.

The product of its (nonzero) digits is 5248800, while the sum is 57.

The square root of 656990895 is about 25631.8336253964. The cubic root of 656990895 is about 869.3335694356. Note that the first 3 decimals are identical.

The spelling of 656990895 in words is "six hundred fifty-six million, nine hundred ninety thousand, eight hundred ninety-five".