166557663807 has 8 divisors (see below), whose sum is σ = 226801925376. Its totient is φ = 108675922392.

The previous prime is 166557663739. The next prime is 166557663817. The reversal of 166557663807 is 708366755661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166557663807 - 2⁸ = 166557663551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166557663817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 590629873 + ... + 590630154.

It is an arithmetic number, because the mean of its divisors is an integer number (28350240672).

Almost surely, 2^166557663807 is an apocalyptic number.

166557663807 is a deficient number, since it is larger than the sum of its proper divisors (60244261569).

166557663807 is a wasteful number, since it uses less digits than its factorization.

166557663807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181260077.

The product of its (nonzero) digits is 38102400, while the sum is 60.

The spelling of 166557663807 in words is "one hundred sixty-six billion, five hundred fifty-seven million, six hundred sixty-three thousand, eight hundred seven".