18000018000077 has 2 divisors, whose sum is σ = 18000018000078. Its totient is φ = 18000018000076.

The previous prime is 18000018000073. The next prime is 18000018000179. The reversal of 18000018000077 is 77000081000081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15328015840201 + 2672002159876 = 3915101^2 + 1634626^2 .

It is an emirp because it is prime and its reverse (77000081000081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18000018000077 - 2² = 18000018000073 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18000018000073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9000009000038 + 9000009000039.

It is an arithmetic number, because the mean of its divisors is an integer number (9000009000039).

Almost surely, 2^{18000018000077} is an apocalyptic number.

It is an amenable number.

18000018000077 is a deficient number, since it is larger than the sum of its proper divisors (1).

18000018000077 is an equidigital number, since it uses as much as digits as its factorization.

18000018000077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3136, while the sum is 32.

The spelling of 18000018000077 in words is "eighteen trillion, eighteen million, seventy-seven", and thus it is an aban number and an uban number.