656161279 has 4 divisors (see below), whose sum is σ = 678787560. Its totient is φ = 633535000.

The previous prime is 656161277. The next prime is 656161321. The reversal of 656161279 is 972161656.

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

It is a cyclic number.

It is not a de Polignac number, because 656161279 - 2¹ = 656161277 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 (656161277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11313097 + ... + 11313154.

It is an arithmetic number, because the mean of its divisors is an integer number (169696890).

Almost surely, 2^656161279 is an apocalyptic number.

656161279 is a deficient number, since it is larger than the sum of its proper divisors (22626281).

656161279 is a wasteful number, since it uses less digits than its factorization.

656161279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22626280.

The product of its digits is 136080, while the sum is 43.

The square root of 656161279 is about 25615.6451997602. The cubic root of 656161279 is about 868.9674979888.

The spelling of 656161279 in words is "six hundred fifty-six million, one hundred sixty-one thousand, two hundred seventy-nine".