18851107499 has 4 divisors (see below), whose sum is σ = 21544122864. Its totient is φ = 16158092136.

The previous prime is 18851107439. The next prime is 18851107519. The reversal of 18851107499 is 99470115881.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18851107499 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18851107499.

It is not an unprimeable number, because it can be changed into a prime (18851107439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1346507672 + ... + 1346507685.

It is an arithmetic number, because the mean of its divisors is an integer number (5386030716).

Almost surely, 2^18851107499 is an apocalyptic number.

18851107499 is a deficient number, since it is larger than the sum of its proper divisors (2693015365).

18851107499 is an equidigital number, since it uses as much as digits as its factorization.

18851107499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2693015364.

The product of its (nonzero) digits is 725760, while the sum is 53.

The spelling of 18851107499 in words is "eighteen billion, eight hundred fifty-one million, one hundred seven thousand, four hundred ninety-nine".