111691357957 has 4 divisors (see below), whose sum is σ = 111692030656. Its totient is φ = 111690685260.

The previous prime is 111691357933. The next prime is 111691358021. The reversal of 111691357957 is 759753196111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111691357957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111691357898 and 111691357907.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 111268 + ... + 485554.

It is an arithmetic number, because the mean of its divisors is an integer number (27923007664).

Almost surely, 2^111691357957 is an apocalyptic number.

It is an amenable number.

111691357957 is a deficient number, since it is larger than the sum of its proper divisors (672699).

111691357957 is an equidigital number, since it uses as much as digits as its factorization.

111691357957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672698.

The product of its digits is 1786050, while the sum is 55.

The spelling of 111691357957 in words is "one hundred eleven billion, six hundred ninety-one million, three hundred fifty-seven thousand, nine hundred fifty-seven".