115774847991 has 40 divisors (see below), whose sum is σ = 189230465424. Its totient is φ = 69958183680.

The previous prime is 115774847953. The next prime is 115774848011. The reversal of 115774847991 is 199748477511.

115774847991 is a `hidden beast` number, since 1 + 1 + 5 + 7 + 74 + 8 + 479 + 91 = 666.

It is not a de Polignac number, because 115774847991 - 2⁶ = 115774847927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115774847911) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 107481 + ... + 493053.

Almost surely, 2^115774847991 is an apocalyptic number.

115774847991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

115774847991 is a deficient number, since it is larger than the sum of its proper divisors (73455617433).

115774847991 is a wasteful number, since it uses less digits than its factorization.

115774847991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385933 (or 385924 counting only the distinct ones).

The product of its digits is 17781120, while the sum is 63.

The spelling of 115774847991 in words is "one hundred fifteen billion, seven hundred seventy-four million, eight hundred forty-seven thousand, nine hundred ninety-one".