66425503 has 4 divisors (see below), whose sum is σ = 67110400. Its totient is φ = 65740608.

The previous prime is 66425473. The next prime is 66425531. The reversal of 66425503 is 30552466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66425503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66425533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 342303 + ... + 342496.

It is an arithmetic number, because the mean of its divisors is an integer number (16777600).

Almost surely, 2^66425503 is an apocalyptic number.

66425503 is a deficient number, since it is larger than the sum of its proper divisors (684897).

66425503 is an equidigital number, since it uses as much as digits as its factorization.

66425503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684896.

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 66425503 is about 8150.1842310466. The cubic root of 66425503 is about 404.9906069050.

Adding to 66425503 its reverse (30552466), we get a palindrome (96977969).

The spelling of 66425503 in words is "sixty-six million, four hundred twenty-five thousand, five hundred three".