166806708568 has 8 divisors (see below), whose sum is σ = 312762578580. Its totient is φ = 83403354280.

The previous prime is 166806708553. The next prime is 166806708581. The reversal of 166806708568 is 865807608661.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×166806708568² (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, 10425419278 + ... + 10425419293.

Almost surely, 2^166806708568 is an apocalyptic number.

It is an amenable number.

166806708568 is a deficient number, since it is larger than the sum of its proper divisors (145955870012).

166806708568 is a wasteful number, since it uses less digits than its factorization.

166806708568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20850838577 (or 20850838573 counting only the distinct ones).

The product of its (nonzero) digits is 23224320, while the sum is 61.

The spelling of 166806708568 in words is "one hundred sixty-six billion, eight hundred six million, seven hundred eight thousand, five hundred sixty-eight".