721736785639116 has 288 divisors, whose sum is σ = 2118816925283520. Its totient is φ = 211045955549184.

The previous prime is 721736785639097. The next prime is 721736785639187. The reversal of 721736785639116 is 611936587637127.

721736785639116 is a `hidden beast` number, since 7 + 2 + 17 + 36 + 7 + 8 + 563 + 9 + 1 + 16 = 666.

It is a super-2 number, since 2×721736785639116² (a number of 31 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 92294836 + ... + 99808868.

It is an arithmetic number, because the mean of its divisors is an integer number (7357003212790).

Almost surely, 2^{721736785639116} 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 721736785639116, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1059408462641760).

721736785639116 is an abundant number, since it is smaller than the sum of its proper divisors (1397080139644404).

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

721736785639116 is a wasteful number, since it uses less digits than its factorization.

721736785639116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7514182 (or 7514131 counting only the distinct ones).

The product of its digits is 480090240, while the sum is 72.

The spelling of 721736785639116 in words is "seven hundred twenty-one trillion, seven hundred thirty-six billion, seven hundred eighty-five million, six hundred thirty-nine thousand, one hundred sixteen".