22605531961 has 2 divisors, whose sum is σ = 22605531962. Its totient is φ = 22605531960.

The previous prime is 22605531953. The next prime is 22605531997. The reversal of 22605531961 is 16913550622.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20831437561 + 1774094400 = 144331^2 + 42120^2 .

It is a cyclic number.

It is not a de Polignac number, because 22605531961 - 2³ = 22605531953 is a prime.

It is a super-2 number, since 2×22605531961² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22605531911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11302765980 + 11302765981.

It is an arithmetic number, because the mean of its divisors is an integer number (11302765981).

Almost surely, 2^22605531961 is an apocalyptic number.

It is an amenable number.

22605531961 is a deficient number, since it is larger than the sum of its proper divisors (1).

22605531961 is an equidigital number, since it uses as much as digits as its factorization.

22605531961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 40.

The spelling of 22605531961 in words is "twenty-two billion, six hundred five million, five hundred thirty-one thousand, nine hundred sixty-one".