22155259997 has 6 divisors (see below), whose sum is σ = 23990607162. Its totient is φ = 20451009072.

The previous prime is 22155259993. The next prime is 22155259999. The reversal of 22155259997 is 79995255122.

It can be written as a sum of positive squares in 3 ways, for example, as 312193561 + 21843066436 = 17669^2 + 147794^2 .

It is not a de Polignac number, because 22155259997 - 2² = 22155259993 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22155259993) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 65547938 + ... + 65548275.

It is an arithmetic number, because the mean of its divisors is an integer number (3998434527).

Almost surely, 2^22155259997 is an apocalyptic number.

It is an amenable number.

22155259997 is a deficient number, since it is larger than the sum of its proper divisors (1835347165).

22155259997 is a wasteful number, since it uses less digits than its factorization.

22155259997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131096239 (or 131096226 counting only the distinct ones).

The product of its digits is 5103000, while the sum is 56.

The spelling of 22155259997 in words is "twenty-two billion, one hundred fifty-five million, two hundred fifty-nine thousand, nine hundred ninety-seven".