11666664571 has 2 divisors, whose sum is σ = 11666664572. Its totient is φ = 11666664570.

The previous prime is 11666664551. The next prime is 11666664587. The reversal of 11666664571 is 17546666611.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11666664571 is a prime.

It is a super-2 number, since 2×11666664571² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11666664551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5833332285 + 5833332286.

It is an arithmetic number, because the mean of its divisors is an integer number (5833332286).

Almost surely, 2^11666664571 is an apocalyptic number.

11666664571 is a deficient number, since it is larger than the sum of its proper divisors (1).

11666664571 is an equidigital number, since it uses as much as digits as its factorization.

11666664571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 49.

The spelling of 11666664571 in words is "eleven billion, six hundred sixty-six million, six hundred sixty-four thousand, five hundred seventy-one".