656244089901 has 16 divisors (see below), whose sum is σ = 973058181120. Its totient is φ = 437115938400.

The previous prime is 656244089873. The next prime is 656244089939. The reversal of 656244089901 is 109980442656.

656244089901 is a `hidden beast` number, since 6 + 5 + 624 + 4 + 0 + 8 + 9 + 9 + 0 + 1 = 666.

It is not a de Polignac number, because 656244089901 - 2¹³ = 656244081709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656244089981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10527280 + ... + 10589433.

It is an arithmetic number, because the mean of its divisors is an integer number (60816136320).

Almost surely, 2^656244089901 is an apocalyptic number.

It is an amenable number.

656244089901 is a deficient number, since it is larger than the sum of its proper divisors (316814091219).

656244089901 is a wasteful number, since it uses less digits than its factorization.

656244089901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21117873 (or 21117867 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 54.

The spelling of 656244089901 in words is "six hundred fifty-six billion, two hundred forty-four million, eighty-nine thousand, nine hundred one".