18543350864 has 20 divisors (see below), whose sum is σ = 36054704256. Its totient is φ = 9238911072.

The previous prime is 18543350863. The next prime is 18543350869. The reversal of 18543350864 is 46805334581.

It is a super-2 number, since 2×18543350864² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18543350863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2043104 + ... + 2052159.

Almost surely, 2^18543350864 is an apocalyptic number.

It is an amenable number.

18543350864 is a deficient number, since it is larger than the sum of its proper divisors (17511353392).

18543350864 is a wasteful number, since it uses less digits than its factorization.

18543350864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4095554 (or 4095548 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 47.

The spelling of 18543350864 in words is "eighteen billion, five hundred forty-three million, three hundred fifty thousand, eight hundred sixty-four".