721057755612 has 12 divisors (see below), whose sum is σ = 1682468096456. Its totient is φ = 240352585200.

The previous prime is 721057755527. The next prime is 721057755653. The reversal of 721057755612 is 216557750127.

721057755612 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

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, 30044073139 + ... + 30044073162.

Almost surely, 2^721057755612 is an apocalyptic number.

It is an amenable number.

721057755612 is an abundant number, since it is smaller than the sum of its proper divisors (961410340844).

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

721057755612 is a wasteful number, since it uses less digits than its factorization.

721057755612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60088146308 (or 60088146306 counting only the distinct ones).

The product of its (nonzero) digits is 1029000, while the sum is 48.

The spelling of 721057755612 in words is "seven hundred twenty-one billion, fifty-seven million, seven hundred fifty-five thousand, six hundred twelve".