656404101 has 16 divisors (see below), whose sum is σ = 985774720. Its totient is φ = 431606880.

The previous prime is 656404069. The next prime is 656404117. The reversal of 656404101 is 101404656.

656404101 is a `hidden beast` number, since 6 + 5 + 640 + 4 + 10 + 1 = 666.

It is not a de Polignac number, because 656404101 - 2⁵ = 656404069 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656404121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164545 + ... + 168486.

It is an arithmetic number, because the mean of its divisors is an integer number (61610920).

Almost surely, 2^656404101 is an apocalyptic number.

It is an amenable number.

656404101 is a deficient number, since it is larger than the sum of its proper divisors (329370619).

656404101 is a wasteful number, since it uses less digits than its factorization.

656404101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333113 (or 333107 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 656404101 is about 25620.3844818925. The cubic root of 656404101 is about 869.0746761117.

Adding to 656404101 its reverse (101404656), we get a palindrome (757808757).

The spelling of 656404101 in words is "six hundred fifty-six million, four hundred four thousand, one hundred one".