656212545550 has 24 divisors (see below), whose sum is σ = 1226751065496. Its totient is φ = 261152603040.

The previous prime is 656212545523. The next prime is 656212545559. The reversal of 656212545550 is 55545212656.

It is a super-2 number, since 2×656212545550² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 656212545550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656212545559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33300432 + ... + 33320131.

It is an arithmetic number, because the mean of its divisors is an integer number (51114627729).

Almost surely, 2^656212545550 is an apocalyptic number.

656212545550 is a deficient number, since it is larger than the sum of its proper divisors (570538519946).

656212545550 is a wasteful number, since it uses less digits than its factorization.

656212545550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66620772 (or 66620767 counting only the distinct ones).

The product of its (nonzero) digits is 1800000, while the sum is 46.

The spelling of 656212545550 in words is "six hundred fifty-six billion, two hundred twelve million, five hundred forty-five thousand, five hundred fifty".