66776955800 has 24 divisors (see below), whose sum is σ = 155256422700. Its totient is φ = 26710782240.

The previous prime is 66776955779. The next prime is 66776955803. The reversal of 66776955800 is 855967766.

It is a hoax number, since the sum of its digits (59) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 66776955800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66776955803) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 166942190 + ... + 166942589.

Almost surely, 2^66776955800 is an apocalyptic number.

It is an amenable number.

66776955800 is an abundant number, since it is smaller than the sum of its proper divisors (88479466900).

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

66776955800 is a wasteful number, since it uses less digits than its factorization.

66776955800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333884795 (or 333884786 counting only the distinct ones).

The product of its (nonzero) digits is 19051200, while the sum is 59.

The spelling of 66776955800 in words is "sixty-six billion, seven hundred seventy-six million, nine hundred fifty-five thousand, eight hundred".