18785894401 has 2 divisors, whose sum is σ = 18785894402. Its totient is φ = 18785894400.

The previous prime is 18785894357. The next prime is 18785894411. The reversal of 18785894401 is 10449858781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17387059600 + 1398834801 = 131860^2 + 37401^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18785894401 is a prime.

It is not a weakly prime, because it can be changed into another prime (18785894411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9392947200 + 9392947201.

It is an arithmetic number, because the mean of its divisors is an integer number (9392947201).

Almost surely, 2^18785894401 is an apocalyptic number.

It is an amenable number.

18785894401 is a deficient number, since it is larger than the sum of its proper divisors (1).

18785894401 is an equidigital number, since it uses as much as digits as its factorization.

18785894401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2580480, while the sum is 55.

The spelling of 18785894401 in words is "eighteen billion, seven hundred eighty-five million, eight hundred ninety-four thousand, four hundred one".