66545625 has 20 divisors (see below), whose sum is σ = 110877008. Its totient is φ = 35490000.

The previous prime is 66545621. The next prime is 66545629. The reversal of 66545625 is 52654566.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66545621) and next prime (66545629).

It is not a de Polignac number, because 66545625 - 2² = 66545621 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66545621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 15871 + ... + 19620.

Almost surely, 2^66545625 is an apocalyptic number.

It is an amenable number.

66545625 is a deficient number, since it is larger than the sum of its proper divisors (44331383).

66545625 is an equidigital number, since it uses as much as digits as its factorization.

66545625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35514 (or 35499 counting only the distinct ones).

The product of its digits is 216000, while the sum is 39.

The square root of 66545625 is about 8157.5501837255. The cubic root of 66545625 is about 405.2345844146.

The spelling of 66545625 in words is "sixty-six million, five hundred forty-five thousand, six hundred twenty-five".