66828425 has 6 divisors (see below), whose sum is σ = 82867278. Its totient is φ = 53462720.

The previous prime is 66828371. The next prime is 66828431. The reversal of 66828425 is 52482866.

It can be written as a sum of positive squares in 3 ways, for example, as 373321 + 66455104 = 611^2 + 8152^2 .

It is a de Polignac number, because none of the positive numbers 2^k-66828425 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1336544 + ... + 1336593.

It is an arithmetic number, because the mean of its divisors is an integer number (13811213).

Almost surely, 2^66828425 is an apocalyptic number.

It is an amenable number.

66828425 is a deficient number, since it is larger than the sum of its proper divisors (16038853).

66828425 is a wasteful number, since it uses less digits than its factorization.

66828425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2673147 (or 2673142 counting only the distinct ones).

The product of its digits is 184320, while the sum is 41.

The square root of 66828425 is about 8174.8654423177. The cubic root of 66828425 is about 405.8078171054.

The spelling of 66828425 in words is "sixty-six million, eight hundred twenty-eight thousand, four hundred twenty-five".