18378577673 has 2 divisors, whose sum is σ = 18378577674. Its totient is φ = 18378577672.

The previous prime is 18378577627. The next prime is 18378577687. The reversal of 18378577673 is 37677587381.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11718712009 + 6659865664 = 108253^2 + 81608^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18378577673 is a prime.

It is not a weakly prime, because it can be changed into another prime (18378570673) by changing a digit.

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 as a sum of consecutive naturals, namely, 9189288836 + 9189288837.

It is an arithmetic number, because the mean of its divisors is an integer number (9189288837).

Almost surely, 2^18378577673 is an apocalyptic number.

It is an amenable number.

18378577673 is a deficient number, since it is larger than the sum of its proper divisors (1).

18378577673 is an equidigital number, since it uses as much as digits as its factorization.

18378577673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41489280, while the sum is 62.

The spelling of 18378577673 in words is "eighteen billion, three hundred seventy-eight million, five hundred seventy-seven thousand, six hundred seventy-three".