721600515820 has 12 divisors (see below), whose sum is σ = 1515361083264. Its totient is φ = 288640206320.

The previous prime is 721600515751. The next prime is 721600515859. The reversal of 721600515820 is 28515006127.

It is a self number, because there is not a number n which added to its sum of digits gives 721600515820.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18040012876 + ... + 18040012915.

It is an arithmetic number, because the mean of its divisors is an integer number (126280090272).

Almost surely, 2^721600515820 is an apocalyptic number.

It is an amenable number.

721600515820 is an abundant number, since it is smaller than the sum of its proper divisors (793760567444).

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

721600515820 is a wasteful number, since it uses less digits than its factorization.

721600515820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36080025800 (or 36080025798 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 37.

The spelling of 721600515820 in words is "seven hundred twenty-one billion, six hundred million, five hundred fifteen thousand, eight hundred twenty".