18684065077 has 2 divisors, whose sum is σ = 18684065078. Its totient is φ = 18684065076.

The previous prime is 18684065051. The next prime is 18684065083. The reversal of 18684065077 is 77056048681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17194027876 + 1490037201 = 131126^2 + 38601^2 .

It is an emirp because it is prime and its reverse (77056048681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18684065077 - 2¹¹ = 18684063029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18684065677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9342032538 + 9342032539.

It is an arithmetic number, because the mean of its divisors is an integer number (9342032539).

Almost surely, 2^18684065077 is an apocalyptic number.

It is an amenable number.

18684065077 is a deficient number, since it is larger than the sum of its proper divisors (1).

18684065077 is an equidigital number, since it uses as much as digits as its factorization.

18684065077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2257920, while the sum is 52.

The spelling of 18684065077 in words is "eighteen billion, six hundred eighty-four million, sixty-five thousand, seventy-seven".