66828470025 has 12 divisors (see below), whose sum is σ = 110489737232. Its totient is φ = 35641850640.

The previous prime is 66828470021. The next prime is 66828470039. The reversal of 66828470025 is 52007482866.

66828470025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66828470025 - 2² = 66828470021 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66828470021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 445523059 + ... + 445523208.

Almost surely, 2^66828470025 is an apocalyptic number.

It is an amenable number.

66828470025 is a deficient number, since it is larger than the sum of its proper divisors (43661267207).

66828470025 is a wasteful number, since it uses less digits than its factorization.

66828470025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891046280 (or 891046275 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 48.

The spelling of 66828470025 in words is "sixty-six billion, eight hundred twenty-eight million, four hundred seventy thousand, twenty-five".