66826204720 has 80 divisors (see below), whose sum is σ = 170475687072. Its totient is φ = 24159918080.

The previous prime is 66826204699. The next prime is 66826204727. The reversal of 66826204720 is 2740262866.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (66826204727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67237 + ... + 371716.

Almost surely, 2^66826204720 is an apocalyptic number.

It is an amenable number.

66826204720 is an abundant number, since it is smaller than the sum of its proper divisors (103649482352).

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

66826204720 is a wasteful number, since it uses less digits than its factorization.

66826204720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439150 (or 439144 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 43.

The spelling of 66826204720 in words is "sixty-six billion, eight hundred twenty-six million, two hundred four thousand, seven hundred twenty".