656400899 has 16 divisors (see below), whose sum is σ = 827573760. Its totient is φ = 505728960.

The previous prime is 656400869. The next prime is 656400907. The reversal of 656400899 is 998004656.

656400899 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 656400899 - 2¹² = 656396803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656400859) 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, 41039 + ... + 54744.

It is an arithmetic number, because the mean of its divisors is an integer number (51723360).

Almost surely, 2^656400899 is an apocalyptic number.

656400899 is a deficient number, since it is larger than the sum of its proper divisors (171172861).

656400899 is a wasteful number, since it uses less digits than its factorization.

656400899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95890.

The product of its (nonzero) digits is 466560, while the sum is 47.

The square root of 656400899 is about 25620.3219925121. The cubic root of 656400899 is about 869.0732629672.

The spelling of 656400899 in words is "six hundred fifty-six million, four hundred thousand, eight hundred ninety-nine".