18538361379 has 36 divisors (see below), whose sum is σ = 28019688840. Its totient is φ = 12263996160.

The previous prime is 18538361377. The next prime is 18538361381. The reversal of 18538361379 is 97316383581.

18538361379 is a `hidden beast` number, since 1 + 8 + 538 + 36 + 1 + 3 + 79 = 666.

It is an interprime number because it is at equal distance from previous prime (18538361377) and next prime (18538361381).

It is not a de Polignac number, because 18538361379 - 2¹ = 18538361377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18538361371) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 848707 + ... + 870275.

It is an arithmetic number, because the mean of its divisors is an integer number (778324690).

Almost surely, 2^18538361379 is an apocalyptic number.

18538361379 is a deficient number, since it is larger than the sum of its proper divisors (9481327461).

18538361379 is an frugal number, since it uses more digits than its factorization.

18538361379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21724 (or 21703 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The spelling of 18538361379 in words is "eighteen billion, five hundred thirty-eight million, three hundred sixty-one thousand, three hundred seventy-nine".