18361669507 has 2 divisors, whose sum is σ = 18361669508. Its totient is φ = 18361669506.

The previous prime is 18361669481. The next prime is 18361669531. The reversal of 18361669507 is 70596616381.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (70596616381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18361669507 - 2⁷ = 18361669379 is a prime.

It is not a weakly prime, because it can be changed into another prime (18361669307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9180834753 + 9180834754.

It is an arithmetic number, because the mean of its divisors is an integer number (9180834754).

Almost surely, 2^18361669507 is an apocalyptic number.

18361669507 is a deficient number, since it is larger than the sum of its proper divisors (1).

18361669507 is an equidigital number, since it uses as much as digits as its factorization.

18361669507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The spelling of 18361669507 in words is "eighteen billion, three hundred sixty-one million, six hundred sixty-nine thousand, five hundred seven".