166582500091 has 12 divisors (see below), whose sum is σ = 193788708528. Its totient is φ = 142778320272.

The previous prime is 166582500079. The next prime is 166582500101. The reversal of 166582500091 is 190005285661.

It is not a de Polignac number, because 166582500091 - 2²¹ = 166580402939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166582500001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1180105 + ... + 1313701.

It is an arithmetic number, because the mean of its divisors is an integer number (16149059044).

Almost surely, 2^166582500091 is an apocalyptic number.

166582500091 is a deficient number, since it is larger than the sum of its proper divisors (27206208437).

166582500091 is a wasteful number, since it uses less digits than its factorization.

166582500091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159058 (or 159051 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 43.

The spelling of 166582500091 in words is "one hundred sixty-six billion, five hundred eighty-two million, five hundred thousand, ninety-one".