11987642879 has 4 divisors (see below), whose sum is σ = 11987898384. Its totient is φ = 11987387376.

The previous prime is 11987642869. The next prime is 11987642893. The reversal of 11987642879 is 97824678911.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11987642879 - 2²⁰ = 11986594303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11987642819) 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, 34862 + ... + 158715.

It is an arithmetic number, because the mean of its divisors is an integer number (2996974596).

Almost surely, 2^11987642879 is an apocalyptic number.

11987642879 is a deficient number, since it is larger than the sum of its proper divisors (255505).

11987642879 is an equidigital number, since it uses as much as digits as its factorization.

11987642879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255504.

The product of its digits is 12192768, while the sum is 62.

The spelling of 11987642879 in words is "eleven billion, nine hundred eighty-seven million, six hundred forty-two thousand, eight hundred seventy-nine".