18649530868 has 12 divisors (see below), whose sum is σ = 32748069060. Its totient is φ = 9292939712.

The previous prime is 18649530853. The next prime is 18649530871. The reversal of 18649530868 is 86803594681.

It can be written as a sum of positive squares in 2 ways, for example, as 17056882404 + 1592648464 = 130602^2 + 39908^2 .

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 3 ways as a sum of consecutive naturals, for example, 7955113 + ... + 7957456.

It is an arithmetic number, because the mean of its divisors is an integer number (2729005755).

Almost surely, 2^18649530868 is an apocalyptic number.

It is an amenable number.

18649530868 is a deficient number, since it is larger than the sum of its proper divisors (14098538192).

18649530868 is a wasteful number, since it uses less digits than its factorization.

18649530868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15912866 (or 15912864 counting only the distinct ones).

The product of its (nonzero) digits is 9953280, while the sum is 58.

The spelling of 18649530868 in words is "eighteen billion, six hundred forty-nine million, five hundred thirty thousand, eight hundred sixty-eight".