12115581987 has 8 divisors (see below), whose sum is σ = 16154629120. Its totient is φ = 8076794760.

The previous prime is 12115581967. The next prime is 12115582043. The reversal of 12115581987 is 78918551121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12115581987 - 2²⁰ = 12114533411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12115581967) 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, 115062 + ... + 193572.

It is an arithmetic number, because the mean of its divisors is an integer number (2019328640).

Almost surely, 2^12115581987 is an apocalyptic number.

12115581987 is a deficient number, since it is larger than the sum of its proper divisors (4039047133).

12115581987 is an equidigital number, since it uses as much as digits as its factorization.

12115581987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129953.

The product of its digits is 201600, while the sum is 48.

The spelling of 12115581987 in words is "twelve billion, one hundred fifteen million, five hundred eighty-one thousand, nine hundred eighty-seven".