18378789128471 has 2 divisors, whose sum is σ = 18378789128472. Its totient is φ = 18378789128470.

The previous prime is 18378789128383. The next prime is 18378789128489. The reversal of 18378789128471 is 17482198787381.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18378789128471 is a prime.

It is a super-3 number, since 3×18378789128471³ (a number of 41 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18378789121471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9189394564235 + 9189394564236.

It is an arithmetic number, because the mean of its divisors is an integer number (9189394564236).

Almost surely, 2^{18378789128471} is an apocalyptic number.

18378789128471 is a deficient number, since it is larger than the sum of its proper divisors (1).

18378789128471 is an equidigital number, since it uses as much as digits as its factorization.

18378789128471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 303464448, while the sum is 74.

The spelling of 18378789128471 in words is "eighteen trillion, three hundred seventy-eight billion, seven hundred eighty-nine million, one hundred twenty-eight thousand, four hundred seventy-one".