656747772361920 has 224 divisors, whose sum is σ = 2340745356600000. Its totient is φ = 173327246917632.

The previous prime is 656747772361903. The next prime is 656747772362029. The reversal of 656747772361920 is 29163277747656.

656747772361920 is a `hidden beast` number, since 6 + 5 + 6 + 7 + 477 + 7 + 2 + 3 + 61 + 92 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 390978795 + ... + 392654954.

It is an arithmetic number, because the mean of its divisors is an integer number (10449756056250).

Almost surely, 2^{656747772361920} is an apocalyptic number.

656747772361920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

656747772361920 is an abundant number, since it is smaller than the sum of its proper divisors (1683997584238080).

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

656747772361920 is a wasteful number, since it uses less digits than its factorization.

656747772361920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783633872 (or 783633856 counting only the distinct ones).

The product of its (nonzero) digits is 1120210560, while the sum is 72.

The spelling of 656747772361920 in words is "six hundred fifty-six trillion, seven hundred forty-seven billion, seven hundred seventy-two million, three hundred sixty-one thousand, nine hundred twenty".