111691357947 has 16 divisors (see below), whose sum is σ = 178197038880. Its totient is φ = 68733143136.

The previous prime is 111691357933. The next prime is 111691358021. The reversal of 111691357947 is 749753196111.

111691357947 is a `hidden beast` number, since 1 + 1 + 1 + 69 + 1 + 3 + 579 + 4 + 7 = 666.

It is not a de Polignac number, because 111691357947 - 2²⁰ = 111690309371 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 111691357893 and 111691357902.

It is not an unprimeable number, because it can be changed into a prime (111691357927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159104148 + ... + 159104849.

It is an arithmetic number, because the mean of its divisors is an integer number (11137314930).

Almost surely, 2^111691357947 is an apocalyptic number.

111691357947 is a deficient number, since it is larger than the sum of its proper divisors (66505680933).

111691357947 is a wasteful number, since it uses less digits than its factorization.

111691357947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318209019 (or 318209013 counting only the distinct ones).

The product of its digits is 1428840, while the sum is 54.

The spelling of 111691357947 in words is "one hundred eleven billion, six hundred ninety-one million, three hundred fifty-seven thousand, nine hundred forty-seven".