22722166781 has 2 divisors, whose sum is σ = 22722166782. Its totient is φ = 22722166780.

The previous prime is 22722166723. The next prime is 22722166847. The reversal of 22722166781 is 18766122722.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22720738756 + 1428025 = 150734^2 + 1195^2 .

It is a cyclic number.

It is not a de Polignac number, because 22722166781 - 2²² = 22717972477 is a prime.

It is a super-2 number, since 2×22722166781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22722166981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11361083390 + 11361083391.

It is an arithmetic number, because the mean of its divisors is an integer number (11361083391).

Almost surely, 2^22722166781 is an apocalyptic number.

It is an amenable number.

22722166781 is a deficient number, since it is larger than the sum of its proper divisors (1).

22722166781 is an equidigital number, since it uses as much as digits as its factorization.

22722166781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 44.

The spelling of 22722166781 in words is "twenty-two billion, seven hundred twenty-two million, one hundred sixty-six thousand, seven hundred eighty-one".