18538361377 has 2 divisors, whose sum is σ = 18538361378. Its totient is φ = 18538361376.

The previous prime is 18538361371. The next prime is 18538361381. The reversal of 18538361377 is 77316383581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15326192401 + 3212168976 = 123799^2 + 56676^2 .

It is an emirp because it is prime and its reverse (77316383581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18538361377 - 2⁷ = 18538361249 is a prime.

It is a super-2 number, since 2×18538361377² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18538361371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9269180688 + 9269180689.

It is an arithmetic number, because the mean of its divisors is an integer number (9269180689).

Almost surely, 2^18538361377 is an apocalyptic number.

It is an amenable number.

18538361377 is a deficient number, since it is larger than the sum of its proper divisors (1).

18538361377 is an equidigital number, since it uses as much as digits as its factorization.

18538361377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2540160, while the sum is 52.

The spelling of 18538361377 in words is "eighteen billion, five hundred thirty-eight million, three hundred sixty-one thousand, three hundred seventy-seven".