18474611693 has 2 divisors, whose sum is σ = 18474611694. Its totient is φ = 18474611692.

The previous prime is 18474611567. The next prime is 18474611731. The reversal of 18474611693 is 39611647481.

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., 9907813444 + 8566798249 = 99538^2 + 92557^2 .

It is a cyclic number.

It is not a de Polignac number, because 18474611693 - 2¹² = 18474607597 is a prime.

It is a super-2 number, since 2×18474611693² (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 (18474611893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9237305846 + 9237305847.

It is an arithmetic number, because the mean of its divisors is an integer number (9237305847).

Almost surely, 2^18474611693 is an apocalyptic number.

It is an amenable number.

18474611693 is a deficient number, since it is larger than the sum of its proper divisors (1).

18474611693 is an equidigital number, since it uses as much as digits as its factorization.

18474611693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 50.

The spelling of 18474611693 in words is "eighteen billion, four hundred seventy-four million, six hundred eleven thousand, six hundred ninety-three".