722166637 has 2 divisors, whose sum is σ = 722166638. Its totient is φ = 722166636.

The previous prime is 722166587. The next prime is 722166689. The reversal of 722166637 is 736661227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 452583076 + 269583561 = 21274^2 + 16419^2 .

It is a cyclic number.

It is not a de Polignac number, because 722166637 - 2⁷ = 722166509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 722166637.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (722166437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361083318 + 361083319.

It is an arithmetic number, because the mean of its divisors is an integer number (361083319).

Almost surely, 2^722166637 is an apocalyptic number.

It is an amenable number.

722166637 is a deficient number, since it is larger than the sum of its proper divisors (1).

722166637 is an equidigital number, since it uses as much as digits as its factorization.

722166637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 40.

The square root of 722166637 is about 26873.1582996863. The cubic root of 722166637 is about 897.1790839571.

The spelling of 722166637 in words is "seven hundred twenty-two million, one hundred sixty-six thousand, six hundred thirty-seven".