656940797 has 4 divisors (see below), whose sum is σ = 665940060. Its totient is φ = 647941536.

The previous prime is 656940793. The next prime is 656940811. The reversal of 656940797 is 797049656.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 147355321 + 509585476 = 12139^2 + 22574^2 .

It is a cyclic number.

It is not a de Polignac number, because 656940797 - 2² = 656940793 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656940793) 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 3 ways as a sum of consecutive naturals, for example, 4499522 + ... + 4499667.

It is an arithmetic number, because the mean of its divisors is an integer number (166485015).

Almost surely, 2^656940797 is an apocalyptic number.

It is an amenable number.

656940797 is a deficient number, since it is larger than the sum of its proper divisors (8999263).

656940797 is an equidigital number, since it uses as much as digits as its factorization.

656940797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8999262.

The product of its (nonzero) digits is 2857680, while the sum is 53.

The square root of 656940797 is about 25630.8563454286. The cubic root of 656940797 is about 869.3114722343.

The spelling of 656940797 in words is "six hundred fifty-six million, nine hundred forty thousand, seven hundred ninety-seven".