12013878857 has 4 divisors (see below), whose sum is σ = 12536221440. Its totient is φ = 11491536276.

The previous prime is 12013878839. The next prime is 12013878871. The reversal of 12013878857 is 75887831021.

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 12013878857 - 2¹⁶ = 12013813321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12013878887) 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, 261171257 + ... + 261171302.

It is an arithmetic number, because the mean of its divisors is an integer number (3134055360).

Almost surely, 2^12013878857 is an apocalyptic number.

It is an amenable number.

12013878857 is a deficient number, since it is larger than the sum of its proper divisors (522342583).

12013878857 is an equidigital number, since it uses as much as digits as its factorization.

12013878857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522342582.

The product of its (nonzero) digits is 752640, while the sum is 50.

The spelling of 12013878857 in words is "twelve billion, thirteen million, eight hundred seventy-eight thousand, eight hundred fifty-seven".