18396598403 has 2 divisors, whose sum is σ = 18396598404. Its totient is φ = 18396598402.

The previous prime is 18396598351. The next prime is 18396598487. The reversal of 18396598403 is 30489569381.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (30489569381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18396598403 - 2²⁸ = 18128162947 is a prime.

It is not a weakly prime, because it can be changed into another prime (18396591403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9198299201 + 9198299202.

It is an arithmetic number, because the mean of its divisors is an integer number (9198299202).

Almost surely, 2^18396598403 is an apocalyptic number.

18396598403 is a deficient number, since it is larger than the sum of its proper divisors (1).

18396598403 is an equidigital number, since it uses as much as digits as its factorization.

18396598403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5598720, while the sum is 56.

The spelling of 18396598403 in words is "eighteen billion, three hundred ninety-six million, five hundred ninety-eight thousand, four hundred three".