656917801 has 4 divisors (see below), whose sum is σ = 657612432. Its totient is φ = 656223172.

The previous prime is 656917771. The next prime is 656917813. The reversal of 656917801 is 108719656.

It is a happy number.

656917801 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 656917801 - 2⁵ = 656917769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656917871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345895 + ... + 347788.

It is an arithmetic number, because the mean of its divisors is an integer number (164403108).

Almost surely, 2^656917801 is an apocalyptic number.

It is an amenable number.

656917801 is a deficient number, since it is larger than the sum of its proper divisors (694631).

656917801 is an equidigital number, since it uses as much as digits as its factorization.

656917801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694630.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 656917801 is about 25630.4077415869. The cubic root of 656917801 is about 869.3013287937.

The spelling of 656917801 in words is "six hundred fifty-six million, nine hundred seventeen thousand, eight hundred one".