18419623859 has 24 divisors (see below), whose sum is σ = 23114912688. Its totient is φ = 14548645440.

The previous prime is 18419623843. The next prime is 18419623907. The reversal of 18419623859 is 95832691481.

It is not a de Polignac number, because 18419623859 - 2⁴ = 18419623843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18419623829) 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, 349289 + ... + 398549.

It is an arithmetic number, because the mean of its divisors is an integer number (963121362).

Almost surely, 2^18419623859 is an apocalyptic number.

18419623859 is a deficient number, since it is larger than the sum of its proper divisors (4695288829).

18419623859 is a wasteful number, since it uses less digits than its factorization.

18419623859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49875 (or 49868 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 56.

The spelling of 18419623859 in words is "eighteen billion, four hundred nineteen million, six hundred twenty-three thousand, eight hundred fifty-nine".