11525567138 has 6 divisors (see below), whose sum is σ = 17288578449. Its totient is φ = 5762707656.

The previous prime is 11525567107. The next prime is 11525567147. The reversal of 11525567138 is 83176552511.

It can be written as a sum of positive squares in 2 ways, for example, as 10604262529 + 921304609 = 102977^2 + 30353^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=75913.

It is a super-2 number, since 2×11525567138² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 113870 + ... + 189782.

Almost surely, 2^11525567138 is an apocalyptic number.

11525567138 is a deficient number, since it is larger than the sum of its proper divisors (5763011311).

11525567138 is an frugal number, since it uses more digits than its factorization.

11525567138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151828 (or 75915 counting only the distinct ones).

The product of its digits is 252000, while the sum is 44.

The spelling of 11525567138 in words is "eleven billion, five hundred twenty-five million, five hundred sixty-seven thousand, one hundred thirty-eight".