12180591857 has 4 divisors (see below), whose sum is σ = 13920676416. Its totient is φ = 10440507300.

The previous prime is 12180591847. The next prime is 12180591859. The reversal of 12180591857 is 75819508121.

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 a cyclic number.

It is not a de Polignac number, because 12180591857 - 2⁶ = 12180591793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12180591859) 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, 870042269 + ... + 870042282.

It is an arithmetic number, because the mean of its divisors is an integer number (3480169104).

Almost surely, 2^12180591857 is an apocalyptic number.

It is an amenable number.

12180591857 is a deficient number, since it is larger than the sum of its proper divisors (1740084559).

12180591857 is an equidigital number, since it uses as much as digits as its factorization.

12180591857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1740084558.

The product of its (nonzero) digits is 201600, while the sum is 47.

The spelling of 12180591857 in words is "twelve billion, one hundred eighty million, five hundred ninety-one thousand, eight hundred fifty-seven".