721938666700 has 18 divisors (see below), whose sum is σ = 1566606906956. Its totient is φ = 288775466640.

The previous prime is 721938666671. The next prime is 721938666731. The reversal of 721938666700 is 7666839127.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3609693234 + ... + 3609693433.

Almost surely, 2^721938666700 is an apocalyptic number.

It is an amenable number.

721938666700 is an abundant number, since it is smaller than the sum of its proper divisors (844668240256).

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

721938666700 is a wasteful number, since it uses less digits than its factorization.

721938666700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7219386681 (or 7219386674 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 55.

The spelling of 721938666700 in words is "seven hundred twenty-one billion, nine hundred thirty-eight million, six hundred sixty-six thousand, seven hundred".