66471425 has 12 divisors (see below), whose sum is σ = 84653436. Its totient is φ = 51739200.

The previous prime is 66471389. The next prime is 66471467. The reversal of 66471425 is 52417466.

It can be written as a sum of positive squares in 6 ways, for example, as 5193841 + 61277584 = 2279^2 + 7828^2 .

It is not a de Polignac number, because 66471425 - 2¹² = 66467329 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35006 + ... + 36855.

It is an arithmetic number, because the mean of its divisors is an integer number (7054453).

Almost surely, 2^66471425 is an apocalyptic number.

It is an amenable number.

66471425 is a deficient number, since it is larger than the sum of its proper divisors (18182011).

66471425 is a wasteful number, since it uses less digits than its factorization.

66471425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71908 (or 71903 counting only the distinct ones).

The product of its digits is 40320, while the sum is 35.

The square root of 66471425 is about 8153.0009812338. Note that the first 3 decimals coincide. The cubic root of 66471425 is about 405.0839129079.

The spelling of 66471425 in words is "sixty-six million, four hundred seventy-one thousand, four hundred twenty-five".