721673776532 has 12 divisors (see below), whose sum is σ = 1281778797600. Its totient is φ = 355451262936.

The previous prime is 721673776513. The next prime is 721673776601. The reversal of 721673776532 is 235677376127.

It is a happy number.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 1346406032 + ... + 1346406567.

It is an arithmetic number, because the mean of its divisors is an integer number (106814899800).

Almost surely, 2^721673776532 is an apocalyptic number.

It is an amenable number.

721673776532 is a deficient number, since it is larger than the sum of its proper divisors (560105021068).

721673776532 is a wasteful number, since it uses less digits than its factorization.

721673776532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2692812670 (or 2692812668 counting only the distinct ones).

The product of its digits is 15558480, while the sum is 56.

The spelling of 721673776532 in words is "seven hundred twenty-one billion, six hundred seventy-three million, seven hundred seventy-six thousand, five hundred thirty-two".