66278894972 has 12 divisors (see below), whose sum is σ = 115992681336. Its totient is φ = 33138128880.

The previous prime is 66278894923. The next prime is 66278894977. The reversal of 66278894972 is 27949887266.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66278894977) 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 3 ways as a sum of consecutive naturals, for example, 211883 + ... + 421250.

It is an arithmetic number, because the mean of its divisors is an integer number (9666056778).

Almost surely, 2^66278894972 is an apocalyptic number.

It is an amenable number.

66278894972 is a deficient number, since it is larger than the sum of its proper divisors (49713786364).

66278894972 is a wasteful number, since it uses less digits than its factorization.

66278894972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659308 (or 659306 counting only the distinct ones).

The product of its digits is 146313216, while the sum is 68.

The spelling of 66278894972 in words is "sixty-six billion, two hundred seventy-eight million, eight hundred ninety-four thousand, nine hundred seventy-two".