656101005989 has 16 divisors (see below), whose sum is σ = 770913690624. Its totient is φ = 550495905600.

The previous prime is 656101005983. The next prime is 656101006003. The reversal of 656101005989 is 989500101656.

It is a cyclic number.

It is not a de Polignac number, because 656101005989 - 2⁸ = 656101005733 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656101005983) 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 15 ways as a sum of consecutive naturals, for example, 692759 + ... + 1338699.

It is an arithmetic number, because the mean of its divisors is an integer number (48182105664).

Almost surely, 2^656101005989 is an apocalyptic number.

It is an amenable number.

656101005989 is a deficient number, since it is larger than the sum of its proper divisors (114812684635).

656101005989 is a wasteful number, since it uses less digits than its factorization.

656101005989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653068.

The product of its (nonzero) digits is 583200, while the sum is 50.

The spelling of 656101005989 in words is "six hundred fifty-six billion, one hundred one million, five thousand, nine hundred eighty-nine".