11666878047 has 24 divisors (see below), whose sum is σ = 19351762560. Its totient is φ = 6698684880.

The previous prime is 11666877979. The next prime is 11666878049. The reversal of 11666878047 is 74087866611.

It is not a de Polignac number, because 11666878047 - 2⁷ = 11666877919 is a prime.

It is a super-2 number, since 2×11666878047² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11666877984 and 11666878002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11666878049) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3099363 + ... + 3103124.

It is an arithmetic number, because the mean of its divisors is an integer number (806323440).

Almost surely, 2^11666878047 is an apocalyptic number.

11666878047 is a deficient number, since it is larger than the sum of its proper divisors (7684884513).

11666878047 is a wasteful number, since it uses less digits than its factorization.

11666878047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6202523 (or 6202520 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 54.

The spelling of 11666878047 in words is "eleven billion, six hundred sixty-six million, eight hundred seventy-eight thousand, forty-seven".