721611662312 has 32 divisors (see below), whose sum is σ = 1363561500000. Its totient is φ = 357998332608.

The previous prime is 721611662293. The next prime is 721611662341. The reversal of 721611662312 is 213266116127.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1698314 + ... + 2080262.

It is an arithmetic number, because the mean of its divisors is an integer number (42611296875).

Almost surely, 2^721611662312 is an apocalyptic number.

It is an amenable number.

721611662312 is a deficient number, since it is larger than the sum of its proper divisors (641949837688).

721611662312 is a wasteful number, since it uses less digits than its factorization.

721611662312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383793 (or 383789 counting only the distinct ones).

The product of its digits is 36288, while the sum is 38.

Adding to 721611662312 its reverse (213266116127), we get a palindrome (934877778439).

The spelling of 721611662312 in words is "seven hundred twenty-one billion, six hundred eleven million, six hundred sixty-two thousand, three hundred twelve".