23162211581 has 2 divisors, whose sum is σ = 23162211582. Its totient is φ = 23162211580.

The previous prime is 23162211557. The next prime is 23162211593. The reversal of 23162211581 is 18511226132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18040519225 + 5121692356 = 134315^2 + 71566^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23162211581 is a prime.

It is a super-2 number, since 2×23162211581² (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 (23162211481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11581105790 + 11581105791.

It is an arithmetic number, because the mean of its divisors is an integer number (11581105791).

Almost surely, 2^23162211581 is an apocalyptic number.

It is an amenable number.

23162211581 is a deficient number, since it is larger than the sum of its proper divisors (1).

23162211581 is an equidigital number, since it uses as much as digits as its factorization.

23162211581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 32.

The spelling of 23162211581 in words is "twenty-three billion, one hundred sixty-two million, two hundred eleven thousand, five hundred eighty-one".