12537617522 has 4 divisors (see below), whose sum is σ = 18806426286. Its totient is φ = 6268808760.

The previous prime is 12537617507. The next prime is 12537617551. The reversal of 12537617522 is 22571673521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22571673521 = 1879 ⋅12012599.

It can be written as a sum of positive squares in only one way, i.e., 6645673441 + 5891944081 = 81521^2 + 76759^2 .

It is a super-2 number, since 2×12537617522² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12537617522.

It is an unprimeable number.

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, 3134404379 + ... + 3134404382.

Almost surely, 2^12537617522 is an apocalyptic number.

12537617522 is a deficient number, since it is larger than the sum of its proper divisors (6268808764).

12537617522 is an equidigital number, since it uses as much as digits as its factorization.

12537617522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6268808763.

The product of its digits is 176400, while the sum is 41.

The spelling of 12537617522 in words is "twelve billion, five hundred thirty-seven million, six hundred seventeen thousand, five hundred twenty-two".