656920784993 has 4 divisors (see below), whose sum is σ = 716640856368. Its totient is φ = 597200713620.

The previous prime is 656920784977. The next prime is 656920785047. The reversal of 656920784993 is 399487029656.

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 a cyclic number.

It is not a de Polignac number, because 656920784993 - 2⁴ = 656920784977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656920754993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29860035671 + ... + 29860035692.

It is an arithmetic number, because the mean of its divisors is an integer number (179160214092).

Almost surely, 2^656920784993 is an apocalyptic number.

It is an amenable number.

656920784993 is a deficient number, since it is larger than the sum of its proper divisors (59720071375).

656920784993 is a wasteful number, since it uses less digits than its factorization.

656920784993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59720071374.

The product of its (nonzero) digits is 176359680, while the sum is 68.

The spelling of 656920784993 in words is "six hundred fifty-six billion, nine hundred twenty million, seven hundred eighty-four thousand, nine hundred ninety-three".