66720325 has 48 divisors (see below), whose sum is σ = 102743424. Its totient is φ = 41932800.

The previous prime is 66720299. The next prime is 66720337. The reversal of 66720325 is 52302766.

66720325 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 66720325 - 2⁷ = 66720197 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 121702 + ... + 122248.

It is an arithmetic number, because the mean of its divisors is an integer number (2140488).

Almost surely, 2^66720325 is an apocalyptic number.

It is an amenable number.

66720325 is a deficient number, since it is larger than the sum of its proper divisors (36023099).

66720325 is a wasteful number, since it uses less digits than its factorization.

66720325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622 (or 617 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 66720325 is about 8168.2510367887. The cubic root of 66720325 is about 405.5888908053.

The spelling of 66720325 in words is "sixty-six million, seven hundred twenty thousand, three hundred twenty-five".