18140191669 has 2 divisors, whose sum is σ = 18140191670. Its totient is φ = 18140191668.

The previous prime is 18140191591. The next prime is 18140191691. The reversal of 18140191669 is 96619104181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13528016100 + 4612175569 = 116310^2 + 67913^2 .

It is a cyclic number.

It is not a de Polignac number, because 18140191669 - 2⁷ = 18140191541 is a prime.

It is a super-2 number, since 2×18140191669² (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 (18140191469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9070095834 + 9070095835.

It is an arithmetic number, because the mean of its divisors is an integer number (9070095835).

Almost surely, 2^18140191669 is an apocalyptic number.

It is an amenable number.

18140191669 is a deficient number, since it is larger than the sum of its proper divisors (1).

18140191669 is an equidigital number, since it uses as much as digits as its factorization.

18140191669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 46.

The spelling of 18140191669 in words is "eighteen billion, one hundred forty million, one hundred ninety-one thousand, six hundred sixty-nine".