722602661 has 16 divisors (see below), whose sum is σ = 865866240. Its totient is φ = 595275120.

The previous prime is 722602633. The next prime is 722602693. The reversal of 722602661 is 166206227.

It is not a de Polignac number, because 722602661 - 2¹⁰ = 722601637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722602061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70355 + ... + 79968.

It is an arithmetic number, because the mean of its divisors is an integer number (54116640).

Almost surely, 2^722602661 is an apocalyptic number.

It is an amenable number.

722602661 is a deficient number, since it is larger than the sum of its proper divisors (143263579).

722602661 is a wasteful number, since it uses less digits than its factorization.

722602661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150376.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 722602661 is about 26881.2697058751. The cubic root of 722602661 is about 897.3596115017.

Adding to 722602661 its reverse (166206227), we get a palindrome (888808888).

The spelling of 722602661 in words is "seven hundred twenty-two million, six hundred two thousand, six hundred sixty-one".