11871720108 has 18 divisors (see below), whose sum is σ = 30009070364. Its totient is φ = 3957240024.

The previous prime is 11871720101. The next prime is 11871720121. The reversal of 11871720108 is 80102717811.

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 329770003 = 11871720108 / (1 + 1 + 8 + 7 + 1 + 7 + 2 + 0 + 1 + 0 + 8).

It is not an unprimeable number, because it can be changed into a prime (11871720101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 164884966 + ... + 164885037.

Almost surely, 2^11871720108 is an apocalyptic number.

11871720108 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

11871720108 is an abundant number, since it is smaller than the sum of its proper divisors (18137350256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11871720108 is a wasteful number, since it uses less digits than its factorization.

11871720108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329770013 (or 329770008 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 36.

The spelling of 11871720108 in words is "eleven billion, eight hundred seventy-one million, seven hundred twenty thousand, one hundred eight".