12081957894 has 40 divisors (see below), whose sum is σ = 27092751840. Its totient is φ = 4024311984.

The previous prime is 12081957889. The next prime is 12081957967. The reversal of 12081957894 is 49875918021.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 12081957894.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 195267 + ... + 249585.

It is an arithmetic number, because the mean of its divisors is an integer number (677318796).

Almost surely, 2^12081957894 is an apocalyptic number.

12081957894 is an abundant number, since it is smaller than the sum of its proper divisors (15010793946).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12081957894 is a wasteful number, since it uses less digits than its factorization.

12081957894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55706 (or 55697 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 54.

The spelling of 12081957894 in words is "twelve billion, eighty-one million, nine hundred fifty-seven thousand, eight hundred ninety-four".