722220561 has 12 divisors (see below), whose sum is σ = 1067468688. Its totient is φ = 470282904.

The previous prime is 722220557. The next prime is 722220601. The reversal of 722220561 is 165022227.

It is not a de Polignac number, because 722220561 - 2² = 722220557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (722220461) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 932715 + ... + 933488.

It is an arithmetic number, because the mean of its divisors is an integer number (88955724).

Almost surely, 2^722220561 is an apocalyptic number.

It is an amenable number.

722220561 is a deficient number, since it is larger than the sum of its proper divisors (345248127).

722220561 is a wasteful number, since it uses less digits than its factorization.

722220561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1866252 (or 1866249 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 722220561 is about 26874.1615869221. The cubic root of 722220561 is about 897.2014141131.

Adding to 722220561 its reverse (165022227), we get a palindrome (887242788).

The spelling of 722220561 in words is "seven hundred twenty-two million, two hundred twenty thousand, five hundred sixty-one".