12181134657 has 4 divisors (see below), whose sum is σ = 16241512880. Its totient is φ = 8120756436.

The previous prime is 12181134613. The next prime is 12181134671. The reversal of 12181134657 is 75643118121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12181134657 - 2³² = 7886167361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12181134157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2030189107 + ... + 2030189112.

It is an arithmetic number, because the mean of its divisors is an integer number (4060378220).

Almost surely, 2^12181134657 is an apocalyptic number.

It is an amenable number.

12181134657 is a deficient number, since it is larger than the sum of its proper divisors (4060378223).

12181134657 is an equidigital number, since it uses as much as digits as its factorization.

12181134657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4060378222.

The product of its digits is 40320, while the sum is 39.

The spelling of 12181134657 in words is "twelve billion, one hundred eighty-one million, one hundred thirty-four thousand, six hundred fifty-seven".