22156187657 has 2 divisors, whose sum is σ = 22156187658. Its totient is φ = 22156187656.

The previous prime is 22156187653. The next prime is 22156187699. The reversal of 22156187657 is 75678165122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19834778896 + 2321408761 = 140836^2 + 48181^2 .

It is a cyclic number.

It is not a de Polignac number, because 22156187657 - 2² = 22156187653 is a prime.

It is not a weakly prime, because it can be changed into another prime (22156187653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11078093828 + 11078093829.

It is an arithmetic number, because the mean of its divisors is an integer number (11078093829).

Almost surely, 2^22156187657 is an apocalyptic number.

It is an amenable number.

22156187657 is a deficient number, since it is larger than the sum of its proper divisors (1).

22156187657 is an equidigital number, since it uses as much as digits as its factorization.

22156187657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1411200, while the sum is 50.

The spelling of 22156187657 in words is "twenty-two billion, one hundred fifty-six million, one hundred eighty-seven thousand, six hundred fifty-seven".