18123539377 has 2 divisors, whose sum is σ = 18123539378. Its totient is φ = 18123539376.

The previous prime is 18123539363. The next prime is 18123539407. The reversal of 18123539377 is 77393532181.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13972185616 + 4151353761 = 118204^2 + 64431^2 .

It is a cyclic number.

It is not a de Polignac number, because 18123539377 - 2¹⁹ = 18123015089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18123539377.

It is not a weakly prime, because it can be changed into another prime (18123539677) 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, 9061769688 + 9061769689.

It is an arithmetic number, because the mean of its divisors is an integer number (9061769689).

Almost surely, 2^18123539377 is an apocalyptic number.

It is an amenable number.

18123539377 is a deficient number, since it is larger than the sum of its proper divisors (1).

18123539377 is an equidigital number, since it uses as much as digits as its factorization.

18123539377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 952560, while the sum is 49.

The spelling of 18123539377 in words is "eighteen billion, one hundred twenty-three million, five hundred thirty-nine thousand, three hundred seventy-seven".