18940476103489 has 2 divisors, whose sum is σ = 18940476103490. Its totient is φ = 18940476103488.

The previous prime is 18940476103469. The next prime is 18940476103541. The reversal of 18940476103489 is 98430167404981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12724345094400 + 6216131009089 = 3567120^2 + 2493217^2 .

It is a cyclic number.

It is not a de Polignac number, because 18940476103489 - 2⁵ = 18940476103457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18940476103489.

It is not a weakly prime, because it can be changed into another prime (18940476103459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9470238051744 + 9470238051745.

It is an arithmetic number, because the mean of its divisors is an integer number (9470238051745).

Almost surely, 2^{18940476103489} is an apocalyptic number.

It is an amenable number.

18940476103489 is a deficient number, since it is larger than the sum of its proper divisors (1).

18940476103489 is an equidigital number, since it uses as much as digits as its factorization.

18940476103489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41803776, while the sum is 64.

The spelling of 18940476103489 in words is "eighteen trillion, nine hundred forty billion, four hundred seventy-six million, one hundred three thousand, four hundred eighty-nine".