722537676221 has 4 divisors (see below), whose sum is σ = 722542133244. Its totient is φ = 722533219200.

The previous prime is 722537676143. The next prime is 722537676247. The reversal of 722537676221 is 122676735227.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 450893448196 + 271644228025 = 671486^2 + 521195^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-722537676221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 722537676221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722537606221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1975790 + ... + 2312751.

It is an arithmetic number, because the mean of its divisors is an integer number (180635533311).

Almost surely, 2^722537676221 is an apocalyptic number.

It is an amenable number.

722537676221 is a deficient number, since it is larger than the sum of its proper divisors (4457023).

722537676221 is a wasteful number, since it uses less digits than its factorization.

722537676221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4457022.

The product of its digits is 2963520, while the sum is 50.

The spelling of 722537676221 in words is "seven hundred twenty-two billion, five hundred thirty-seven million, six hundred seventy-six thousand, two hundred twenty-one".