722662661 has 4 divisors (see below), whose sum is σ = 825900192. Its totient is φ = 619425132.

The previous prime is 722662643. The next prime is 722662667. The reversal of 722662661 is 166266227.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 722662661 - 2¹⁸ = 722400517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722662667) 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, 51618755 + ... + 51618768.

It is an arithmetic number, because the mean of its divisors is an integer number (206475048).

Almost surely, 2^722662661 is an apocalyptic number.

It is an amenable number.

722662661 is a deficient number, since it is larger than the sum of its proper divisors (103237531).

722662661 is a wasteful number, since it uses less digits than its factorization.

722662661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103237530.

The product of its digits is 72576, while the sum is 38.

The square root of 722662661 is about 26882.3857014217. The cubic root of 722662661 is about 897.3844476896.

The spelling of 722662661 in words is "seven hundred twenty-two million, six hundred sixty-two thousand, six hundred sixty-one".