66823425 has 72 divisors (see below), whose sum is σ = 125349120. Its totient is φ = 34003200.

The previous prime is 66823411. The next prime is 66823433. The reversal of 66823425 is 52432866.

It is not a de Polignac number, because 66823425 - 2⁴ = 66823409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66823425.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 750781 + ... + 750869.

It is an arithmetic number, because the mean of its divisors is an integer number (1740960).

Almost surely, 2^66823425 is an apocalyptic number.

It is an amenable number.

66823425 is a deficient number, since it is larger than the sum of its proper divisors (58525695).

66823425 is a wasteful number, since it uses less digits than its factorization.

66823425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223 (or 215 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 66823425 is about 8174.5596211661. The cubic root of 66823425 is about 405.7976962140.

The spelling of 66823425 in words is "sixty-six million, eight hundred twenty-three thousand, four hundred twenty-five".