656042897 has 8 divisors (see below), whose sum is σ = 666734376. Its totient is φ = 645397632.

The previous prime is 656042813. The next prime is 656042909. The reversal of 656042897 is 798240656.

656042897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 95726656 + 560316241 = 9784^2 + 23671^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 656042897 - 2⁸ = 656042641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656042297) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17663 + ... + 40299.

It is an arithmetic number, because the mean of its divisors is an integer number (83341797).

Almost surely, 2^656042897 is an apocalyptic number.

It is an amenable number.

656042897 is a deficient number, since it is larger than the sum of its proper divisors (10691479).

656042897 is a wasteful number, since it uses less digits than its factorization.

656042897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23107.

The product of its (nonzero) digits is 725760, while the sum is 47.

The square root of 656042897 is about 25613.3343592747. The cubic root of 656042897 is about 868.9152362960.

The spelling of 656042897 in words is "six hundred fifty-six million, forty-two thousand, eight hundred ninety-seven".