320656549454640 has 480 divisors, whose sum is σ = 1360384456340160. Its totient is φ = 68981576638464.

The previous prime is 320656549454627. The next prime is 320656549454641. The reversal of 320656549454640 is 46454945656023.

320656549454640 is a `hidden beast` number, since 3 + 2 + 0 + 6 + 5 + 6 + 5 + 49 + 4 + 546 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (320656549454641) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 87307627 + ... + 90906186.

It is an arithmetic number, because the mean of its divisors is an integer number (2834134284042).

Almost surely, 2^{320656549454640} is an apocalyptic number.

320656549454640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

320656549454640 is an abundant number, since it is smaller than the sum of its proper divisors (1039727906885520).

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

320656549454640 is a wasteful number, since it uses less digits than its factorization.

320656549454640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178213866 (or 178213847 counting only the distinct ones).

The product of its (nonzero) digits is 373248000, while the sum is 63.

The spelling of 320656549454640 in words is "three hundred twenty trillion, six hundred fifty-six billion, five hundred forty-nine million, four hundred fifty-four thousand, six hundred forty".