66216372756 has 24 divisors (see below), whose sum is σ = 155632646400. Its totient is φ = 21911013312.

The previous prime is 66216372749. The next prime is 66216372773. The reversal of 66216372756 is 65727361266.

It is a junction number, because it is equal to n+sod(n) for n = 66216372699 and 66216372708.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 20137156 + ... + 20140443.

It is an arithmetic number, because the mean of its divisors is an integer number (6484693600).

Almost surely, 2^66216372756 is an apocalyptic number.

It is an amenable number.

66216372756 is an abundant number, since it is smaller than the sum of its proper divisors (89416273644).

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

66216372756 is a wasteful number, since it uses less digits than its factorization.

66216372756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40277743 (or 40277741 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 51.

The spelling of 66216372756 in words is "sixty-six billion, two hundred sixteen million, three hundred seventy-two thousand, seven hundred fifty-six".