656899401 has 16 divisors (see below), whose sum is σ = 896716800. Its totient is φ = 427553808.

The previous prime is 656899381. The next prime is 656899403. The reversal of 656899401 is 104998656.

It is not a de Polignac number, because 656899401 - 2¹⁹ = 656375113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (656899403) 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, 53520 + ... + 64638.

It is an arithmetic number, because the mean of its divisors is an integer number (56044800).

Almost surely, 2^656899401 is an apocalyptic number.

It is an amenable number.

656899401 is a deficient number, since it is larger than the sum of its proper divisors (239817399).

656899401 is a wasteful number, since it uses less digits than its factorization.

656899401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11588.

The product of its (nonzero) digits is 466560, while the sum is 48.

The square root of 656899401 is about 25630.0487904335. The cubic root of 656899401 is about 869.2932124592.

The spelling of 656899401 in words is "six hundred fifty-six million, eight hundred ninety-nine thousand, four hundred one".