18399835669 has 2 divisors, whose sum is σ = 18399835670. Its totient is φ = 18399835668.

The previous prime is 18399835633. The next prime is 18399835673. The reversal of 18399835669 is 96653899381.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13107273169 + 5292562500 = 114487^2 + 72750^2 .

It is a cyclic number.

It is not a de Polignac number, because 18399835669 - 2⁷ = 18399835541 is a prime.

It is a super-2 number, since 2×18399835669² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18399835609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9199917834 + 9199917835.

It is an arithmetic number, because the mean of its divisors is an integer number (9199917835).

Almost surely, 2^18399835669 is an apocalyptic number.

It is an amenable number.

18399835669 is a deficient number, since it is larger than the sum of its proper divisors (1).

18399835669 is an equidigital number, since it uses as much as digits as its factorization.

18399835669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75582720, while the sum is 67.

The spelling of 18399835669 in words is "eighteen billion, three hundred ninety-nine million, eight hundred thirty-five thousand, six hundred sixty-nine".