18515036366864 has 80 divisors (see below), whose sum is σ = 39404243145600. Its totient is φ = 8388637221888.

The previous prime is 18515036366863. The next prime is 18515036366873. The reversal of 18515036366864 is 46866363051581.

It is a junction number, because it is equal to n+sod(n) for n = 18515036366797 and 18515036366806.

It is not an unprimeable number, because it can be changed into a prime (18515036366863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 338895902 + ... + 338950530.

It is an arithmetic number, because the mean of its divisors is an integer number (492553039320).

Almost surely, 2^{18515036366864} is an apocalyptic number.

It is an amenable number.

18515036366864 is an abundant number, since it is smaller than the sum of its proper divisors (20889206778736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18515036366864 is a wasteful number, since it uses less digits than its factorization.

18515036366864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103152 (or 103146 counting only the distinct ones).

The product of its (nonzero) digits is 74649600, while the sum is 62.

The spelling of 18515036366864 in words is "eighteen trillion, five hundred fifteen billion, thirty-six million, three hundred sixty-six thousand, eight hundred sixty-four".