166965292091 has 16 divisors (see below), whose sum is σ = 180643313760. Its totient is φ = 153406863360.

The previous prime is 166965291973. The next prime is 166965292093. The reversal of 166965292091 is 190292569661.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166965292091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166965292093) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17985371 + ... + 17994651.

It is an arithmetic number, because the mean of its divisors is an integer number (11290207110).

Almost surely, 2^166965292091 is an apocalyptic number.

166965292091 is a deficient number, since it is larger than the sum of its proper divisors (13678021669).

166965292091 is a wasteful number, since it uses less digits than its factorization.

166965292091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15566.

The product of its (nonzero) digits is 3149280, while the sum is 56.

The spelling of 166965292091 in words is "one hundred sixty-six billion, nine hundred sixty-five million, two hundred ninety-two thousand, ninety-one".