11666510115966 has 40 divisors (see below), whose sum is σ = 26163391503744. Its totient is φ = 3885598641600.

The previous prime is 11666510115937. The next prime is 11666510116013. The reversal of 11666510115966 is 66951101566611.

11666510115966 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×11666510115966² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 29786910 + ... + 30176033.

Almost surely, 2^{11666510115966} is an apocalyptic number.

11666510115966 is an abundant number, since it is smaller than the sum of its proper divisors (14496881387778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11666510115966 is a wasteful number, since it uses less digits than its factorization.

11666510115966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59964158 (or 59964149 counting only the distinct ones).

The product of its (nonzero) digits is 1749600, while the sum is 54.

The spelling of 11666510115966 in words is "eleven trillion, six hundred sixty-six billion, five hundred ten million, one hundred fifteen thousand, nine hundred sixty-six".