18897582793 has 2 divisors, whose sum is σ = 18897582794. Its totient is φ = 18897582792.

The previous prime is 18897582757. The next prime is 18897582839. The reversal of 18897582793 is 39728579881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18897451024 + 131769 = 137468^2 + 363^2 .

It is an emirp because it is prime and its reverse (39728579881) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18897582793 is a prime.

It is not a weakly prime, because it can be changed into another prime (18897582703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9448791396 + 9448791397.

It is an arithmetic number, because the mean of its divisors is an integer number (9448791397).

Almost surely, 2^18897582793 is an apocalyptic number.

It is an amenable number.

18897582793 is a deficient number, since it is larger than the sum of its proper divisors (1).

18897582793 is an equidigital number, since it uses as much as digits as its factorization.

18897582793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60963840, while the sum is 67.

The spelling of 18897582793 in words is "eighteen billion, eight hundred ninety-seven million, five hundred eighty-two thousand, seven hundred ninety-three".