166166811868 has 6 divisors (see below), whose sum is σ = 290791920776. Its totient is φ = 83083405932.

The previous prime is 166166811857. The next prime is 166166811953. The reversal of 166166811868 is 868118661661.

It is a happy number.

It is a super-2 number, since 2×166166811868² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20770851480 + ... + 20770851487.

Almost surely, 2^166166811868 is an apocalyptic number.

It is an amenable number.

166166811868 is a deficient number, since it is larger than the sum of its proper divisors (124625108908).

166166811868 is a wasteful number, since it uses less digits than its factorization.

166166811868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41541702971 (or 41541702969 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 58.

The spelling of 166166811868 in words is "one hundred sixty-six billion, one hundred sixty-six million, eight hundred eleven thousand, eight hundred sixty-eight".