18545375882921 has 2 divisors, whose sum is σ = 18545375882922. Its totient is φ = 18545375882920.

The previous prime is 18545375882843. The next prime is 18545375882963. The reversal of 18545375882921 is 12928857354581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16151436643225 + 2393939239696 = 4018885^2 + 1547236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18545375882921 is a prime.

It is not a weakly prime, because it can be changed into another prime (18545375882021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9272687941460 + 9272687941461.

It is an arithmetic number, because the mean of its divisors is an integer number (9272687941461).

Almost surely, 2^{18545375882921} is an apocalyptic number.

It is an amenable number.

18545375882921 is a deficient number, since it is larger than the sum of its proper divisors (1).

18545375882921 is an equidigital number, since it uses as much as digits as its factorization.

18545375882921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536000, while the sum is 68.

The spelling of 18545375882921 in words is "eighteen trillion, five hundred forty-five billion, three hundred seventy-five million, eight hundred eighty-two thousand, nine hundred twenty-one".