18663167377 has 2 divisors, whose sum is σ = 18663167378. Its totient is φ = 18663167376.

The previous prime is 18663167333. The next prime is 18663167399. The reversal of 18663167377 is 77376136681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12585249856 + 6077917521 = 112184^2 + 77961^2 .

It is an emirp because it is prime and its reverse (77376136681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18663167377 - 2¹¹ = 18663165329 is a prime.

It is not a weakly prime, because it can be changed into another prime (18663167177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9331583688 + 9331583689.

It is an arithmetic number, because the mean of its divisors is an integer number (9331583689).

Almost surely, 2^18663167377 is an apocalyptic number.

It is an amenable number.

18663167377 is a deficient number, since it is larger than the sum of its proper divisors (1).

18663167377 is an equidigital number, since it uses as much as digits as its factorization.

18663167377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5334336, while the sum is 55.

The spelling of 18663167377 in words is "eighteen billion, six hundred sixty-three million, one hundred sixty-seven thousand, three hundred seventy-seven".