656670993 has 24 divisors (see below), whose sum is σ = 971976768. Its totient is φ = 394020000.

The previous prime is 656670991. The next prime is 656671009. The reversal of 656670993 is 399076656.

It is not a de Polignac number, because 656670993 - 2¹ = 656670991 is a prime.

It is not an unprimeable number, because it can be changed into a prime (656670991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27708 + ... + 45618.

It is an arithmetic number, because the mean of its divisors is an integer number (40499032).

Almost surely, 2^656670993 is an apocalyptic number.

It is an amenable number.

656670993 is a deficient number, since it is larger than the sum of its proper divisors (315305775).

656670993 is a wasteful number, since it uses less digits than its factorization.

656670993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18037 (or 18026 counting only the distinct ones).

The product of its (nonzero) digits is 1837080, while the sum is 51.

The square root of 656670993 is about 25625.5925394907. The cubic root of 656670993 is about 869.1924478972.

The spelling of 656670993 in words is "six hundred fifty-six million, six hundred seventy thousand, nine hundred ninety-three".