12155422525 has 6 divisors (see below), whose sum is σ = 15072723962. Its totient is φ = 9724338000.

The previous prime is 12155422523. The next prime is 12155422553. The reversal of 12155422525 is 52522455121.

It can be written as a sum of positive squares in 3 ways, for example, as 2271284964 + 9884137561 = 47658^2 + 99419^2 .

It is not a de Polignac number, because 12155422525 - 2¹ = 12155422523 is a prime.

It is a super-2 number, since 2×12155422525² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12155422523) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 243108426 + ... + 243108475.

Almost surely, 2^12155422525 is an apocalyptic number.

It is an amenable number.

12155422525 is a deficient number, since it is larger than the sum of its proper divisors (2917301437).

12155422525 is an equidigital number, since it uses as much as digits as its factorization.

12155422525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486216911 (or 486216906 counting only the distinct ones).

The product of its digits is 40000, while the sum is 34.

Adding to 12155422525 its reverse (52522455121), we get a palindrome (64677877646).

The spelling of 12155422525 in words is "twelve billion, one hundred fifty-five million, four hundred twenty-two thousand, five hundred twenty-five".