166115510001 has 36 divisors (see below), whose sum is σ = 293809760400. Its totient is φ = 89927188848.

The previous prime is 166115509997. The next prime is 166115510111. The reversal of 166115510001 is 100015511661.

It is not a de Polignac number, because 166115510001 - 2² = 166115509997 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166115520001) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9904231 + ... + 9920988.

Almost surely, 2^166115510001 is an apocalyptic number.

It is an amenable number.

166115510001 is a deficient number, since it is larger than the sum of its proper divisors (127694250399).

166115510001 is a wasteful number, since it uses less digits than its factorization.

166115510001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19825258 (or 19825248 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 27.

The spelling of 166115510001 in words is "one hundred sixty-six billion, one hundred fifteen million, five hundred ten thousand, one".