12155981894 has 16 divisors (see below), whose sum is σ = 20866592256. Its totient is φ = 5202765000.

The previous prime is 12155981891. The next prime is 12155981909. The reversal of 12155981894 is 49818955121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12155981891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 567572 + ... + 588599.

It is an arithmetic number, because the mean of its divisors is an integer number (1304162016).

Almost surely, 2^12155981894 is an apocalyptic number.

12155981894 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

12155981894 is a deficient number, since it is larger than the sum of its proper divisors (8710610362).

12155981894 is a wasteful number, since it uses less digits than its factorization.

12155981894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156931.

The product of its digits is 1036800, while the sum is 53.

The spelling of 12155981894 in words is "twelve billion, one hundred fifty-five million, nine hundred eighty-one thousand, eight hundred ninety-four".