12171959425 has 6 divisors (see below), whose sum is σ = 15093229718. Its totient is φ = 9737567520.

The previous prime is 12171959407. The next prime is 12171959441. The reversal of 12171959425 is 52495917121.

It can be written as a sum of positive squares in 3 ways, for example, as 169442289 + 12002517136 = 13017^2 + 109556^2 .

It is not a de Polignac number, because 12171959425 - 2¹⁷ = 12171828353 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 243439164 + ... + 243439213.

Almost surely, 2^12171959425 is an apocalyptic number.

It is an amenable number.

12171959425 is a deficient number, since it is larger than the sum of its proper divisors (2921270293).

12171959425 is an equidigital number, since it uses as much as digits as its factorization.

12171959425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486878387 (or 486878382 counting only the distinct ones).

The product of its digits is 226800, while the sum is 46.

The spelling of 12171959425 in words is "twelve billion, one hundred seventy-one million, nine hundred fifty-nine thousand, four hundred twenty-five".