66205777804 has 12 divisors (see below), whose sum is σ = 115875101664. Its totient is φ = 33098605904.

The previous prime is 66205777801. The next prime is 66205777877. The reversal of 66205777804 is 40877750266.

It is not an unprimeable number, because it can be changed into a prime (66205777801) 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, 1035844 + ... + 1097899.

It is an arithmetic number, because the mean of its divisors is an integer number (9656258472).

Almost surely, 2^66205777804 is an apocalyptic number.

It is an amenable number.

66205777804 is a deficient number, since it is larger than the sum of its proper divisors (49669323860).

66205777804 is a wasteful number, since it uses less digits than its factorization.

66205777804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2141504 (or 2141502 counting only the distinct ones).

The product of its (nonzero) digits is 3951360, while the sum is 52.

The spelling of 66205777804 in words is "sixty-six billion, two hundred five million, seven hundred seventy-seven thousand, eight hundred four".