11618878661 has 8 divisors (see below), whose sum is σ = 12558814464. Its totient is φ = 10685539440.

The previous prime is 11618878643. The next prime is 11618878693. The reversal of 11618878661 is 16687881611.

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

It is a cyclic number.

It is not a de Polignac number, because 11618878661 - 2²⁶ = 11551769797 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 (11618878261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1645481 + ... + 1652526.

It is an arithmetic number, because the mean of its divisors is an integer number (1569851808).

Almost surely, 2^11618878661 is an apocalyptic number.

It is an amenable number.

11618878661 is a deficient number, since it is larger than the sum of its proper divisors (939935803).

11618878661 is a wasteful number, since it uses less digits than its factorization.

11618878661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3298291.

The product of its digits is 774144, while the sum is 53.

The spelling of 11618878661 in words is "eleven billion, six hundred eighteen million, eight hundred seventy-eight thousand, six hundred sixty-one".