66818915530 has 32 divisors (see below), whose sum is σ = 121952314944. Its totient is φ = 26354802816.

The previous prime is 66818915509. The next prime is 66818915539. The reversal of 66818915530 is 3551981866.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (66818915539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3719149 + ... + 3737071.

It is an arithmetic number, because the mean of its divisors is an integer number (3811009842).

Almost surely, 2^66818915530 is an apocalyptic number.

66818915530 is a deficient number, since it is larger than the sum of its proper divisors (55133399414).

66818915530 is a wasteful number, since it uses less digits than its factorization.

66818915530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23110.

The product of its (nonzero) digits is 1555200, while the sum is 52.

The spelling of 66818915530 in words is "sixty-six billion, eight hundred eighteen million, nine hundred fifteen thousand, five hundred thirty".