191557551171 has 24 divisors (see below), whose sum is σ = 307354839120. Its totient is φ = 105686922432.

The previous prime is 191557551151. The next prime is 191557551193. The reversal of 191557551171 is 171155755191.

It is not a de Polignac number, because 191557551171 - 2⁷ = 191557551043 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 191557551171.

It is not an unprimeable number, because it can be changed into a prime (191557551151) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22463196 + ... + 22471721.

It is an arithmetic number, because the mean of its divisors is an integer number (12806451630).

Almost surely, 2^191557551171 is an apocalyptic number.

191557551171 is a deficient number, since it is larger than the sum of its proper divisors (115797287949).

191557551171 is a wasteful number, since it uses less digits than its factorization.

191557551171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44934963 (or 44934956 counting only the distinct ones).

The product of its digits is 275625, while the sum is 48.

The spelling of 191557551171 in words is "one hundred ninety-one billion, five hundred fifty-seven million, five hundred fifty-one thousand, one hundred seventy-one".