18436718439 has 12 divisors (see below), whose sum is σ = 26632008000. Its totient is φ = 12290595264.

The previous prime is 18436718437. The next prime is 18436718453. The reversal of 18436718439 is 93481763481.

It is not a de Polignac number, because 18436718439 - 2¹ = 18436718437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18436718431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 319402 + ... + 372680.

It is an arithmetic number, because the mean of its divisors is an integer number (2219334000).

Almost surely, 2^18436718439 is an apocalyptic number.

18436718439 is a deficient number, since it is larger than the sum of its proper divisors (8195289561).

18436718439 is a wasteful number, since it uses less digits than its factorization.

18436718439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91734 (or 91731 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 54.

The spelling of 18436718439 in words is "eighteen billion, four hundred thirty-six million, seven hundred eighteen thousand, four hundred thirty-nine".