18873478453 has 2 divisors, whose sum is σ = 18873478454. Its totient is φ = 18873478452.

The previous prime is 18873478417. The next prime is 18873478457. The reversal of 18873478453 is 35487437881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17443277329 + 1430201124 = 132073^2 + 37818^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18873478453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18873478457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9436739226 + 9436739227.

It is an arithmetic number, because the mean of its divisors is an integer number (9436739227).

Almost surely, 2^18873478453 is an apocalyptic number.

It is an amenable number.

18873478453 is a deficient number, since it is larger than the sum of its proper divisors (1).

18873478453 is an equidigital number, since it uses as much as digits as its factorization.

18873478453 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18063360, while the sum is 58.

The spelling of 18873478453 in words is "eighteen billion, eight hundred seventy-three million, four hundred seventy-eight thousand, four hundred fifty-three".