166601115999 has 96 divisors (see below), whose sum is σ = 262747929600. Its totient is φ = 101330611200.

The previous prime is 166601115959. The next prime is 166601116013. The reversal of 166601115999 is 999511106661.

It is not a de Polignac number, because 166601115999 - 2¹⁶ = 166601050463 is a prime.

It is a super-2 number, since 2×166601115999² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166601115949) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 439580592 + ... + 439580970.

It is an arithmetic number, because the mean of its divisors is an integer number (2736957600).

Almost surely, 2^166601115999 is an apocalyptic number.

166601115999 is a deficient number, since it is larger than the sum of its proper divisors (96146813601).

166601115999 is a wasteful number, since it uses less digits than its factorization.

166601115999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965 (or 962 counting only the distinct ones).

The product of its (nonzero) digits is 787320, while the sum is 54.

The spelling of 166601115999 in words is "one hundred sixty-six billion, six hundred one million, one hundred fifteen thousand, nine hundred ninety-nine".