22145239957 has 2 divisors, whose sum is σ = 22145239958. Its totient is φ = 22145239956.

The previous prime is 22145239943. The next prime is 22145239997. The reversal of 22145239957 is 75993254122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20088526756 + 2056713201 = 141734^2 + 45351^2 .

It is a cyclic number.

It is not a de Polignac number, because 22145239957 - 2¹¹ = 22145237909 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22145239957.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22145239997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11072619978 + 11072619979.

It is an arithmetic number, because the mean of its divisors is an integer number (11072619979).

Almost surely, 2^22145239957 is an apocalyptic number.

It is an amenable number.

22145239957 is a deficient number, since it is larger than the sum of its proper divisors (1).

22145239957 is an equidigital number, since it uses as much as digits as its factorization.

22145239957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1360800, while the sum is 49.

The spelling of 22145239957 in words is "twenty-two billion, one hundred forty-five million, two hundred thirty-nine thousand, nine hundred fifty-seven".