18771374131538 has 32 divisors (see below), whose sum is σ = 32317001701248. Its totient is φ = 8010507052800.

The previous prime is 18771374131513. The next prime is 18771374131567. The reversal of 18771374131538 is 83513147317781.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27399281 + ... + 28076027.

It is an arithmetic number, because the mean of its divisors is an integer number (1009906303164).

Almost surely, 2^{18771374131538} is an apocalyptic number.

18771374131538 is a deficient number, since it is larger than the sum of its proper divisors (13545627569710).

18771374131538 is a wasteful number, since it uses less digits than its factorization.

18771374131538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685218.

The product of its digits is 11854080, while the sum is 59.

The spelling of 18771374131538 in words is "eighteen trillion, seven hundred seventy-one billion, three hundred seventy-four million, one hundred thirty-one thousand, five hundred thirty-eight".