656261001 has 48 divisors (see below), whose sum is σ = 1109008320. Its totient is φ = 380350080.

The previous prime is 656260973. The next prime is 656261003. The reversal of 656261001 is 100162656.

It is a happy number.

656261001 is a `hidden beast` number, since 656 + 2 + 6 + 1 + 0 + 0 + 1 = 666.

It is not a de Polignac number, because 656261001 - 2⁶ = 656260937 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (656261003) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 155025 + ... + 159201.

It is an arithmetic number, because the mean of its divisors is an integer number (23104340).

Almost surely, 2^656261001 is an apocalyptic number.

It is an amenable number.

656261001 is a deficient number, since it is larger than the sum of its proper divisors (452747319).

656261001 is a wasteful number, since it uses less digits than its factorization.

656261001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4243 (or 4214 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 656261001 is about 25617.5916315332. The cubic root of 656261001 is about 869.0115170382.

The spelling of 656261001 in words is "six hundred fifty-six million, two hundred sixty-one thousand, one".