320861918400 has 168 divisors, whose sum is σ = 1070537701440. Its totient is φ = 84112880640.

The previous prime is 320861918371. The next prime is 320861918479. The reversal of 320861918400 is 4819168023.

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 23 ways as a sum of consecutive naturals, for example, 283294 + ... + 849693.

Almost surely, 2^320861918400 is an apocalyptic number.

320861918400 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

320861918400 is an abundant number, since it is smaller than the sum of its proper divisors (749675783040).

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

320861918400 is a wasteful number, since it uses less digits than its factorization.

320861918400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1133071 (or 1133056 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The spelling of 320861918400 in words is "three hundred twenty billion, eight hundred sixty-one million, nine hundred eighteen thousand, four hundred".