18665836534 has 16 divisors (see below), whose sum is σ = 28210685328. Its totient is φ = 9262311552.

The previous prime is 18665836513. The next prime is 18665836559. The reversal of 18665836534 is 43563856681.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1425682 + ... + 1438714.

It is an arithmetic number, because the mean of its divisors is an integer number (1763167833).

Almost surely, 2^18665836534 is an apocalyptic number.

18665836534 is a deficient number, since it is larger than the sum of its proper divisors (9544848794).

18665836534 is a wasteful number, since it uses less digits than its factorization.

18665836534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18399.

The product of its digits is 12441600, while the sum is 55.

The spelling of 18665836534 in words is "eighteen billion, six hundred sixty-five million, eight hundred thirty-six thousand, five hundred thirty-four".