656236470540 has 48 divisors (see below), whose sum is σ = 2099956707072. Its totient is φ = 149996907456.

The previous prime is 656236470523. The next prime is 656236470551. The reversal of 656236470540 is 45074632656.

It is a self number, because there is not a number n which added to its sum of digits gives 656236470540.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 781233474 + ... + 781234313.

It is an arithmetic number, because the mean of its divisors is an integer number (43749098064).

Almost surely, 2^656236470540 is an apocalyptic number.

656236470540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

656236470540 is an abundant number, since it is smaller than the sum of its proper divisors (1443720236532).

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

656236470540 is a wasteful number, since it uses less digits than its factorization.

656236470540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1562467806 (or 1562467804 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 48.

The spelling of 656236470540 in words is "six hundred fifty-six billion, two hundred thirty-six million, four hundred seventy thousand, five hundred forty".