18857273803 has 2 divisors, whose sum is σ = 18857273804. Its totient is φ = 18857273802.

The previous prime is 18857273801. The next prime is 18857273861. The reversal of 18857273803 is 30837275881.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (30837275881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18857273803 - 2¹ = 18857273801 is a prime.

Together with 18857273801, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18857273801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9428636901 + 9428636902.

It is an arithmetic number, because the mean of its divisors is an integer number (9428636902).

Almost surely, 2^18857273803 is an apocalyptic number.

18857273803 is a deficient number, since it is larger than the sum of its proper divisors (1).

18857273803 is an equidigital number, since it uses as much as digits as its factorization.

18857273803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2257920, while the sum is 52.

The spelling of 18857273803 in words is "eighteen billion, eight hundred fifty-seven million, two hundred seventy-three thousand, eight hundred three".