656161278 has 16 divisors (see below), whose sum is σ = 1312594176. Its totient is φ = 218675160.

The previous prime is 656161277. The next prime is 656161321. The reversal of 656161278 is 872161656.

It is an alternating number because its digits alternate between even and odd.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34125 + ... + 49767.

It is an arithmetic number, because the mean of its divisors is an integer number (82037136).

Almost surely, 2^656161278 is an apocalyptic number.

656161278 is an abundant number, since it is smaller than the sum of its proper divisors (656432898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

656161278 is a wasteful number, since it uses less digits than its factorization.

656161278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22639.

The product of its digits is 120960, while the sum is 42.

The square root of 656161278 is about 25615.6451802409. The cubic root of 656161278 is about 868.9674975473.

The spelling of 656161278 in words is "six hundred fifty-six million, one hundred sixty-one thousand, two hundred seventy-eight".