18301994919 has 24 divisors (see below), whose sum is σ = 28474354272. Its totient is φ = 11260952640.

The previous prime is 18301994903. The next prime is 18301994947. The reversal of 18301994919 is 91949910381.

It is not a de Polignac number, because 18301994919 - 2⁴ = 18301994903 is a prime.

It is a super-2 number, since 2×18301994919² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18301994959) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1293654 + ... + 1307724.

It is an arithmetic number, because the mean of its divisors is an integer number (1186431428).

Almost surely, 2^18301994919 is an apocalyptic number.

18301994919 is a deficient number, since it is larger than the sum of its proper divisors (10172359353).

18301994919 is a wasteful number, since it uses less digits than its factorization.

18301994919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25207 (or 25204 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 54.

The spelling of 18301994919 in words is "eighteen billion, three hundred one million, nine hundred ninety-four thousand, nine hundred nineteen".