191691158166 has 24 divisors (see below), whose sum is σ = 415338926184. Its totient is φ = 63895809120.

The previous prime is 191691158149. The next prime is 191691158167. The reversal of 191691158166 is 661851196191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191691158167) 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, 1637605 + ... + 1750751.

It is an arithmetic number, because the mean of its divisors is an integer number (17305788591).

Almost surely, 2^191691158166 is an apocalyptic number.

191691158166 is an abundant number, since it is smaller than the sum of its proper divisors (223647768018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

191691158166 is a wasteful number, since it uses less digits than its factorization.

191691158166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207276 (or 207273 counting only the distinct ones).

The product of its digits is 699840, while the sum is 54.

The spelling of 191691158166 in words is "one hundred ninety-one billion, six hundred ninety-one million, one hundred fifty-eight thousand, one hundred sixty-six".