66780801 has 32 divisors (see below), whose sum is σ = 104720000. Its totient is φ = 41943744.

The previous prime is 66780793. The next prime is 66780803. The reversal of 66780801 is 10808766.

It is not a de Polignac number, because 66780801 - 2³ = 66780793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66780803) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 178851 + ... + 179223.

It is an arithmetic number, because the mean of its divisors is an integer number (3272500).

Almost surely, 2^66780801 is an apocalyptic number.

It is an amenable number.

66780801 is a deficient number, since it is larger than the sum of its proper divisors (37939199).

66780801 is a wasteful number, since it uses less digits than its factorization.

66780801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750 (or 744 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 66780801 is about 8171.9520923706. The cubic root of 66780801 is about 405.7113971358.

The spelling of 66780801 in words is "sixty-six million, seven hundred eighty thousand, eight hundred one".