66680267564 has 24 divisors (see below), whose sum is σ = 121820213760. Its totient is φ = 31875831504.

The previous prime is 66680267539. The next prime is 66680267639. The reversal of 66680267564 is 46576208666.

It is a happy 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 7 ways as a sum of consecutive naturals, for example, 34157 + ... + 366779.

It is an arithmetic number, because the mean of its divisors is an integer number (5075842240).

Almost surely, 2^66680267564 is an apocalyptic number.

It is an amenable number.

66680267564 is a deficient number, since it is larger than the sum of its proper divisors (55139946196).

66680267564 is a wasteful number, since it uses less digits than its factorization.

66680267564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334829 (or 334827 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 56.

The spelling of 66680267564 in words is "sixty-six billion, six hundred eighty million, two hundred sixty-seven thousand, five hundred sixty-four".