721667560320 has 1024 divisors, whose sum is σ = 3192912691200. Its totient is φ = 150228172800.

The previous prime is 721667560307. The next prime is 721667560357. The reversal of 721667560320 is 23065766127.

721667560320 is a `hidden beast` number, since 7 + 2 + 1 + 6 + 67 + 560 + 3 + 20 = 666.

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 127 ways as a sum of consecutive naturals, for example, 63740260 + ... + 63751580.

It is an arithmetic number, because the mean of its divisors is an integer number (3118078800).

Almost surely, 2^721667560320 is an apocalyptic number.

721667560320 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721667560320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1596456345600).

721667560320 is an abundant number, since it is smaller than the sum of its proper divisors (2471245130880).

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

721667560320 is a wasteful number, since it uses less digits than its factorization.

721667560320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11404 (or 11386 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 45.

The spelling of 721667560320 in words is "seven hundred twenty-one billion, six hundred sixty-seven million, five hundred sixty thousand, three hundred twenty".