18621269593 has 2 divisors, whose sum is σ = 18621269594. Its totient is φ = 18621269592.

The previous prime is 18621269539. The next prime is 18621269657. The reversal of 18621269593 is 39596212681.

Together with previous prime (18621269539) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17974228624 + 647040969 = 134068^2 + 25437^2 .

It is a cyclic number.

It is not a de Polignac number, because 18621269593 - 2³³ = 10031335001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18621269593.

It is not a weakly prime, because it can be changed into another prime (18621269533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9310634796 + 9310634797.

It is an arithmetic number, because the mean of its divisors is an integer number (9310634797).

Almost surely, 2^18621269593 is an apocalyptic number.

It is an amenable number.

18621269593 is a deficient number, since it is larger than the sum of its proper divisors (1).

18621269593 is an equidigital number, since it uses as much as digits as its factorization.

18621269593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1399680, while the sum is 52.

The spelling of 18621269593 in words is "eighteen billion, six hundred twenty-one million, two hundred sixty-nine thousand, five hundred ninety-three".