656341881 has 16 divisors (see below), whose sum is σ = 944483904. Its totient is φ = 403026624.

The previous prime is 656341879. The next prime is 656341919. The reversal of 656341881 is 188143656.

It is not a de Polignac number, because 656341881 - 2¹ = 656341879 is a prime.

It is a super-2 number, since 2×656341881² = 861569329509236322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (656341801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195 + ... + 36231.

It is an arithmetic number, because the mean of its divisors is an integer number (59030244).

Almost surely, 2^656341881 is an apocalyptic number.

It is an amenable number.

656341881 is a deficient number, since it is larger than the sum of its proper divisors (288142023).

656341881 is a wasteful number, since it uses less digits than its factorization.

656341881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36520.

The product of its digits is 138240, while the sum is 42.

The square root of 656341881 is about 25619.1701856247. The cubic root of 656341881 is about 869.0472156216.

The spelling of 656341881 in words is "six hundred fifty-six million, three hundred forty-one thousand, eight hundred eighty-one".