18386161771 has 4 divisors (see below), whose sum is σ = 18386433000. Its totient is φ = 18385890544.

The previous prime is 18386161711. The next prime is 18386161777. The reversal of 18386161771 is 17716168381.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 17716168381 = 1201 ⋅14751181.

It is a cyclic number.

It is not a de Polignac number, because 18386161771 - 2¹⁹ = 18385637483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18386161777) 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 in 3 ways as a sum of consecutive naturals, for example, 64455 + ... + 202303.

It is an arithmetic number, because the mean of its divisors is an integer number (4596608250).

Almost surely, 2^18386161771 is an apocalyptic number.

18386161771 is a deficient number, since it is larger than the sum of its proper divisors (271229).

18386161771 is a wasteful number, since it uses less digits than its factorization.

18386161771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271228.

The product of its digits is 338688, while the sum is 49.

The spelling of 18386161771 in words is "eighteen billion, three hundred eighty-six million, one hundred sixty-one thousand, seven hundred seventy-one".