15722255138 has 6 divisors (see below), whose sum is σ = 23583648699. Its totient is φ = 7861038906.

The previous prime is 15722255137. The next prime is 15722255161. The reversal of 15722255138 is 83155222751.

It can be written as a sum of positive squares in only one way, i.e., 7861127569 + 7861127569 = 88663^2 + 88663^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=88663.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 15722255095 and 15722255104.

It is not an unprimeable number, because it can be changed into a prime (15722255137) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 132995 + ... + 221657.

Almost surely, 2^15722255138 is an apocalyptic number.

15722255138 is a deficient number, since it is larger than the sum of its proper divisors (7861393561).

15722255138 is an frugal number, since it uses more digits than its factorization.

15722255138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177328 (or 88665 counting only the distinct ones).

The product of its digits is 168000, while the sum is 41.

Adding to 15722255138 its reverse (83155222751), we get a palindrome (98877477889).

The spelling of 15722255138 in words is "fifteen billion, seven hundred twenty-two million, two hundred fifty-five thousand, one hundred thirty-eight".