656113661 has 16 divisors (see below), whose sum is σ = 776615040. Its totient is φ = 542351040.

The previous prime is 656113639. The next prime is 656113669. The reversal of 656113661 is 166311656.

It is a de Polignac number, because none of the positive numbers 2^k-656113661 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 (656113669) 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, 257966 + ... + 260496.

It is an arithmetic number, because the mean of its divisors is an integer number (48538440).

Almost surely, 2^656113661 is an apocalyptic number.

It is an amenable number.

656113661 is a deficient number, since it is larger than the sum of its proper divisors (120501379).

656113661 is a wasteful number, since it uses less digits than its factorization.

656113661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3844.

The product of its digits is 19440, while the sum is 35.

The square root of 656113661 is about 25614.7157118716. The cubic root of 656113661 is about 868.9464769905.

The spelling of 656113661 in words is "six hundred fifty-six million, one hundred thirteen thousand, six hundred sixty-one".