656940700139 has 8 divisors (see below), whose sum is σ = 679630331520. Its totient is φ = 634253502400.

The previous prime is 656940700127. The next prime is 656940700177. The reversal of 656940700139 is 931007049656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 656940700139 - 2⁴ = 656940700123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656940700639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50522 + ... + 1147359.

It is an arithmetic number, because the mean of its divisors is an integer number (84953791440).

Almost surely, 2^656940700139 is an apocalyptic number.

656940700139 is a deficient number, since it is larger than the sum of its proper divisors (22689631381).

656940700139 is a wasteful number, since it uses less digits than its factorization.

656940700139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1216821.

The product of its (nonzero) digits is 1224720, while the sum is 50.

The spelling of 656940700139 in words is "six hundred fifty-six billion, nine hundred forty million, seven hundred thousand, one hundred thirty-nine".