721006644002 has 8 divisors (see below), whose sum is σ = 1081514152812. Its totient is φ = 360501926400.

The previous prime is 721006643999. The next prime is 721006644031. The reversal of 721006644002 is 200446600127.

It can be written as a sum of positive squares in 2 ways, for example, as 523034150521 + 197972493481 = 723211^2 + 444941^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 721006644002.

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, 157802 + ... + 1211162.

Almost surely, 2^721006644002 is an apocalyptic number.

721006644002 is a deficient number, since it is larger than the sum of its proper divisors (360507508810).

721006644002 is a wasteful number, since it uses less digits than its factorization.

721006644002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395604.

The product of its (nonzero) digits is 16128, while the sum is 32.

The spelling of 721006644002 in words is "seven hundred twenty-one billion, six million, six hundred forty-four thousand, two".