18385066377 has 12 divisors (see below), whose sum is σ = 26576327284. Its totient is φ = 12247424640.

The previous prime is 18385066351. The next prime is 18385066397. The reversal of 18385066377 is 77366058381.

18385066377 is a `hidden beast` number, since 1 + 8 + 3 + 8 + 506 + 63 + 77 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11191312521 + 7193753856 = 105789^2 + 84816^2 .

It is not a de Polignac number, because 18385066377 - 2¹⁰ = 18385065353 is a prime.

It is a super-2 number, since 2×18385066377² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18385066397) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 761308 + ... + 785085.

Almost surely, 2^18385066377 is an apocalyptic number.

It is an amenable number.

18385066377 is a deficient number, since it is larger than the sum of its proper divisors (8191260907).

18385066377 is a wasteful number, since it uses less digits than its factorization.

18385066377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547720 (or 1547717 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 54.

The spelling of 18385066377 in words is "eighteen billion, three hundred eighty-five million, sixty-six thousand, three hundred seventy-seven".