11866053887 has 4 divisors (see below), whose sum is σ = 11866451160. Its totient is φ = 11865656616.

The previous prime is 11866053757. The next prime is 11866053919. The reversal of 11866053887 is 78835066811.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11866053887 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 (11866053187) 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, 149837 + ... + 214902.

It is an arithmetic number, because the mean of its divisors is an integer number (2966612790).

Almost surely, 2^11866053887 is an apocalyptic number.

11866053887 is a deficient number, since it is larger than the sum of its proper divisors (397273).

11866053887 is an equidigital number, since it uses as much as digits as its factorization.

11866053887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397272.

The product of its (nonzero) digits is 1935360, while the sum is 53.

The spelling of 11866053887 in words is "eleven billion, eight hundred sixty-six million, fifty-three thousand, eight hundred eighty-seven".