18366697693 has 4 divisors (see below), whose sum is σ = 18625383648. Its totient is φ = 18108011740.

The previous prime is 18366697667. The next prime is 18366697697. The reversal of 18366697693 is 39679666381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39679666381 = 41 ⋅967796741.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18366697693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18366697697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129342871 + ... + 129343012.

It is an arithmetic number, because the mean of its divisors is an integer number (4656345912).

Almost surely, 2^18366697693 is an apocalyptic number.

It is an amenable number.

18366697693 is a deficient number, since it is larger than the sum of its proper divisors (258685955).

18366697693 is an equidigital number, since it uses as much as digits as its factorization.

18366697693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258685954.

The product of its digits is 52907904, while the sum is 64.

The spelling of 18366697693 in words is "eighteen billion, three hundred sixty-six million, six hundred ninety-seven thousand, six hundred ninety-three".