12537777425 has 12 divisors (see below), whose sum is σ = 15602179596. Its totient is φ = 9994521600.

The previous prime is 12537777407. The next prime is 12537777431. The reversal of 12537777425 is 52477773521.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 700555024 + 11837222401 = 26468^2 + 108799^2 .

It is not a de Polignac number, because 12537777425 - 2⁸ = 12537777169 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 885344 + ... + 899393.

It is an arithmetic number, because the mean of its divisors is an integer number (1300181633).

Almost surely, 2^12537777425 is an apocalyptic number.

It is an amenable number.

12537777425 is a deficient number, since it is larger than the sum of its proper divisors (3064402171).

12537777425 is a wasteful number, since it uses less digits than its factorization.

12537777425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1785028 (or 1785023 counting only the distinct ones).

The product of its digits is 2881200, while the sum is 50.

The spelling of 12537777425 in words is "twelve billion, five hundred thirty-seven million, seven hundred seventy-seven thousand, four hundred twenty-five".