656133977140 has 12 divisors (see below), whose sum is σ = 1377881352036. Its totient is φ = 262453590848.

The previous prime is 656133977131. The next prime is 656133977167. The reversal of 656133977140 is 41779331656.

It can be written as a sum of positive squares in 2 ways, for example, as 110645377956 + 545488599184 = 332634^2 + 738572^2 .

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 16403349409 + ... + 16403349448.

It is an arithmetic number, because the mean of its divisors is an integer number (114823446003).

Almost surely, 2^656133977140 is an apocalyptic number.

It is an amenable number.

656133977140 is an abundant number, since it is smaller than the sum of its proper divisors (721747374896).

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

656133977140 is a wasteful number, since it uses less digits than its factorization.

656133977140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32806698866 (or 32806698864 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 52.

The spelling of 656133977140 in words is "six hundred fifty-six billion, one hundred thirty-three million, nine hundred seventy-seven thousand, one hundred forty".