18315481156253 has 2 divisors, whose sum is σ = 18315481156254. Its totient is φ = 18315481156252.

The previous prime is 18315481156241. The next prime is 18315481156327. The reversal of 18315481156253 is 35265118451381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16855146672004 + 1460334484249 = 4105502^2 + 1208443^2 .

It is a cyclic number.

It is not a de Polignac number, because 18315481156253 - 2⁴ = 18315481156237 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18315481156195 and 18315481156204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18315481156223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9157740578126 + 9157740578127.

It is an arithmetic number, because the mean of its divisors is an integer number (9157740578127).

Almost surely, 2^{18315481156253} is an apocalyptic number.

It is an amenable number.

18315481156253 is a deficient number, since it is larger than the sum of its proper divisors (1).

18315481156253 is an equidigital number, since it uses as much as digits as its factorization.

18315481156253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456000, while the sum is 53.

The spelling of 18315481156253 in words is "eighteen trillion, three hundred fifteen billion, four hundred eighty-one million, one hundred fifty-six thousand, two hundred fifty-three".