656111020 has 24 divisors (see below), whose sum is σ = 1378335168. Its totient is φ = 262348800.

The previous prime is 656110999. The next prime is 656111033. The reversal of 656111020 is 20111656.

It is a junction number, because it is equal to n+sod(n) for n = 656110982 and 656111000.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 81580 + ... + 89260.

It is an arithmetic number, because the mean of its divisors is an integer number (57430632).

Almost surely, 2^656111020 is an apocalyptic number.

It is an amenable number.

656111020 is an abundant number, since it is smaller than the sum of its proper divisors (722224148).

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

656111020 is a wasteful number, since it uses less digits than its factorization.

656111020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11961 (or 11959 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 656111020 is about 25614.6641594224. The cubic root of 656111020 is about 868.9453110895.

Adding to 656111020 its reverse (20111656), we get a palindrome (676222676).

The spelling of 656111020 in words is "six hundred fifty-six million, one hundred eleven thousand, twenty".