191077895085 has 128 divisors (see below), whose sum is σ = 387924885504. Its totient is φ = 78012668160.

The previous prime is 191077895081. The next prime is 191077895143. The reversal of 191077895085 is 580598770191.

It is a happy number.

It is not a de Polignac number, because 191077895085 - 2² = 191077895081 is a prime.

It is a super-2 number, since 2×191077895085² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191077895081) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 15102232 + ... + 15114878.

It is an arithmetic number, because the mean of its divisors is an integer number (3030663168).

Almost surely, 2^191077895085 is an apocalyptic number.

191077895085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

191077895085 is an abundant number, since it is smaller than the sum of its proper divisors (196846990419).

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

191077895085 is a wasteful number, since it uses less digits than its factorization.

191077895085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12903.

The product of its (nonzero) digits is 6350400, while the sum is 60.

The spelling of 191077895085 in words is "one hundred ninety-one billion, seventy-seven million, eight hundred ninety-five thousand, eighty-five".