108709784991 has 20 divisors (see below), whose sum is σ = 162912496912. Its totient is φ = 72241629408.

The previous prime is 108709784987. The next prime is 108709785013. The reversal of 108709784991 is 199487907801.

It is a happy number.

108709784991 is a `hidden beast` number, since 1 + 0 + 8 + 70 + 9 + 78 + 499 + 1 = 666.

It is not a de Polignac number, because 108709784991 - 2² = 108709784987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108709784941) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2118571 + ... + 2169276.

Almost surely, 2^108709784991 is an apocalyptic number.

108709784991 is a deficient number, since it is larger than the sum of its proper divisors (54202711921).

108709784991 is an equidigital number, since it uses as much as digits as its factorization.

108709784991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4288172 (or 4288163 counting only the distinct ones).

The product of its (nonzero) digits is 9144576, while the sum is 63.

The spelling of 108709784991 in words is "one hundred eight billion, seven hundred nine million, seven hundred eighty-four thousand, nine hundred ninety-one".