111691357899 has 64 divisors (see below), whose sum is σ = 176770252800. Its totient is φ = 61974892800.

The previous prime is 111691357879. The next prime is 111691357927. The reversal of 111691357899 is 998753196111.

It is not a de Polignac number, because 111691357899 - 2⁹ = 111691357387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111691357849) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15720982 + ... + 15728084.

It is an arithmetic number, because the mean of its divisors is an integer number (2762035200).

Almost surely, 2^111691357899 is an apocalyptic number.

111691357899 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

111691357899 is a deficient number, since it is larger than the sum of its proper divisors (65078894901).

111691357899 is a wasteful number, since it uses less digits than its factorization.

111691357899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7976.

The product of its digits is 3674160, while the sum is 60.

The spelling of 111691357899 in words is "one hundred eleven billion, six hundred ninety-one million, three hundred fifty-seven thousand, eight hundred ninety-nine".