18675981493 has 16 divisors (see below), whose sum is σ = 20603056320. Its totient is φ = 16819858944.

The previous prime is 18675981479. The next prime is 18675981497. The reversal of 18675981493 is 39418957681.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18675981493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18675981497) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 501330 + ... + 537292.

It is an arithmetic number, because the mean of its divisors is an integer number (1287691020).

Almost surely, 2^18675981493 is an apocalyptic number.

18675981493 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18675981493 is a deficient number, since it is larger than the sum of its proper divisors (1927074827).

18675981493 is a wasteful number, since it uses less digits than its factorization.

18675981493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36948.

The product of its digits is 13063680, while the sum is 61.

The spelling of 18675981493 in words is "eighteen billion, six hundred seventy-five million, nine hundred eighty-one thousand, four hundred ninety-three".