18857855944903 has 2 divisors, whose sum is σ = 18857855944904. Its totient is φ = 18857855944902.

The previous prime is 18857855944831. The next prime is 18857855944909. The reversal of 18857855944903 is 30944955875881.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18857855944903 - 2²¹ = 18857853847751 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18857855944903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18857855944909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9428927972451 + 9428927972452.

It is an arithmetic number, because the mean of its divisors is an integer number (9428927972452).

Almost surely, 2^{18857855944903} is an apocalyptic number.

18857855944903 is a deficient number, since it is larger than the sum of its proper divisors (1).

18857855944903 is an equidigital number, since it uses as much as digits as its factorization.

18857855944903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824000, while the sum is 76.

The spelling of 18857855944903 in words is "eighteen trillion, eight hundred fifty-seven billion, eight hundred fifty-five million, nine hundred forty-four thousand, nine hundred three".