18913549494 has 24 divisors (see below), whose sum is σ = 44002952568. Its totient is φ = 5403871200.

The previous prime is 18913549493. The next prime is 18913549511. The reversal of 18913549494 is 49494531981.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18913549493) 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, 32165607 + ... + 32166194.

It is an arithmetic number, because the mean of its divisors is an integer number (1833456357).

Almost surely, 2^18913549494 is an apocalyptic number.

18913549494 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18913549494 is an abundant number, since it is smaller than the sum of its proper divisors (25089403074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18913549494 is a wasteful number, since it uses less digits than its factorization.

18913549494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64331820 (or 64331813 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 57.

The spelling of 18913549494 in words is "eighteen billion, nine hundred thirteen million, five hundred forty-nine thousand, four hundred ninety-four".