721668096000 has 960 divisors, whose sum is σ = 2761109944320. Its totient is φ = 185794560000.

The previous prime is 721668095999. The next prime is 721668096047. The reversal of 721668096000 is 690866127.

It is a tau number, because it is divible by the number of its divisors (960).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1714175790 + ... + 1714176210.

It is an arithmetic number, because the mean of its divisors is an integer number (2876156192).

Almost surely, 2^721668096000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721668096000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1380554972160).

721668096000 is an abundant number, since it is smaller than the sum of its proper divisors (2039441848320).

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

721668096000 is an equidigital number, since it uses as much as digits as its factorization.

721668096000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504 (or 462 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 721668096000 in words is "seven hundred twenty-one billion, six hundred sixty-eight million, ninety-six thousand".