18907919699 has 8 divisors (see below), whose sum is σ = 19733016960. Its totient is φ = 18094362496.

The previous prime is 18907919689. The next prime is 18907919729. The reversal of 18907919699 is 99691970981.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18907919699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18907919629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2881667 + ... + 2888220.

It is an arithmetic number, because the mean of its divisors is an integer number (2466627120).

Almost surely, 2^18907919699 is an apocalyptic number.

18907919699 is a deficient number, since it is larger than the sum of its proper divisors (825097261).

18907919699 is a wasteful number, since it uses less digits than its factorization.

18907919699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5770029.

The product of its (nonzero) digits is 19840464, while the sum is 68.

The spelling of 18907919699 in words is "eighteen billion, nine hundred seven million, nine hundred nineteen thousand, six hundred ninety-nine".