66503209386 has 16 divisors (see below), whose sum is σ = 134053714944. Its totient is φ = 21993187104.

The previous prime is 66503209373. The next prime is 66503209411. The reversal of 66503209386 is 68390230566.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 43636515 + ... + 43638038.

It is an arithmetic number, because the mean of its divisors is an integer number (8378357184).

Almost surely, 2^66503209386 is an apocalyptic number.

66503209386 is an abundant number, since it is smaller than the sum of its proper divisors (67550505558).

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

66503209386 is a wasteful number, since it uses less digits than its factorization.

66503209386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87274685.

The product of its (nonzero) digits is 1399680, while the sum is 48.

The spelling of 66503209386 in words is "sixty-six billion, five hundred three million, two hundred nine thousand, three hundred eighty-six".