18857855944933 has 2 divisors, whose sum is σ = 18857855944934. Its totient is φ = 18857855944932.

The previous prime is 18857855944919. The next prime is 18857855944943. The reversal of 18857855944933 is 33944955875881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17873599487524 + 984256457409 = 4227718^2 + 992097^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18857855944933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18857855944903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9428927972466 + 9428927972467.

It is an arithmetic number, because the mean of its divisors is an integer number (9428927972467).

Almost surely, 2^{18857855944933} is an apocalyptic number.

It is an amenable number.

18857855944933 is a deficient number, since it is larger than the sum of its proper divisors (1).

18857855944933 is an equidigital number, since it uses as much as digits as its factorization.

18857855944933 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5225472000, while the sum is 79.

The spelling of 18857855944933 in words is "eighteen trillion, eight hundred fifty-seven billion, eight hundred fifty-five million, nine hundred forty-four thousand, nine hundred thirty-three".