18667843477 has 2 divisors, whose sum is σ = 18667843478. Its totient is φ = 18667843476.

The previous prime is 18667843427. The next prime is 18667843573. The reversal of 18667843477 is 77434876681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13162055076 + 5505788401 = 114726^2 + 74201^2 .

It is an emirp because it is prime and its reverse (77434876681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18667843477 - 2²⁷ = 18533625749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18667843417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9333921738 + 9333921739.

It is an arithmetic number, because the mean of its divisors is an integer number (9333921739).

Almost surely, 2^18667843477 is an apocalyptic number.

It is an amenable number.

18667843477 is a deficient number, since it is larger than the sum of its proper divisors (1).

18667843477 is an equidigital number, since it uses as much as digits as its factorization.

18667843477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37933056, while the sum is 61.

The spelling of 18667843477 in words is "eighteen billion, six hundred sixty-seven million, eight hundred forty-three thousand, four hundred seventy-seven".