66066625 has 16 divisors (see below), whose sum is σ = 83283408. Its totient is φ = 52320000.

The previous prime is 66066617. The next prime is 66066643. The reversal of 66066625 is 52666066.

It can be written as a sum of positive squares in 8 ways, for example, as 18496 + 66048129 = 136^2 + 8127^2 .

It is not a de Polignac number, because 66066625 - 2³ = 66066617 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10009 + ... + 15241.

It is an arithmetic number, because the mean of its divisors is an integer number (5205213).

Almost surely, 2^66066625 is an apocalyptic number.

It is an amenable number.

66066625 is a deficient number, since it is larger than the sum of its proper divisors (17216783).

66066625 is a wasteful number, since it uses less digits than its factorization.

66066625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5349 (or 5339 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 66066625 is about 8128.1378556223. The cubic root of 66066625 is about 404.2599399754.

It can be divided in two parts, 6606 and 6625, that added together give a palindrome (13231).

The spelling of 66066625 in words is "sixty-six million, sixty-six thousand, six hundred twenty-five".