18793668077 has 2 divisors, whose sum is σ = 18793668078. Its totient is φ = 18793668076.

The previous prime is 18793668071. The next prime is 18793668137. The reversal of 18793668077 is 77086639781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9583235236 + 9210432841 = 97894^2 + 95971^2 .

It is an emirp because it is prime and its reverse (77086639781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18793668077 - 2⁶ = 18793668013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18793668071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9396834038 + 9396834039.

It is an arithmetic number, because the mean of its divisors is an integer number (9396834039).

Almost surely, 2^18793668077 is an apocalyptic number.

It is an amenable number.

18793668077 is a deficient number, since it is larger than the sum of its proper divisors (1).

18793668077 is an equidigital number, since it uses as much as digits as its factorization.

18793668077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21337344, while the sum is 62.

The spelling of 18793668077 in words is "eighteen billion, seven hundred ninety-three million, six hundred sixty-eight thousand, seventy-seven".