66665066625 has 48 divisors (see below), whose sum is σ = 120654188928. Its totient is φ = 35412900000.

The previous prime is 66665066617. The next prime is 66665066639. The reversal of 66665066625 is 52666056666.

It is not a de Polignac number, because 66665066625 - 2³ = 66665066617 is a prime.

It is a super-2 number, since 2×66665066625² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 164332 + ... + 400418.

It is an arithmetic number, because the mean of its divisors is an integer number (2513628936).

Almost surely, 2^66665066625 is an apocalyptic number.

It is an amenable number.

66665066625 is a deficient number, since it is larger than the sum of its proper divisors (53989122303).

66665066625 is a wasteful number, since it uses less digits than its factorization.

66665066625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236359 (or 236346 counting only the distinct ones).

The product of its (nonzero) digits is 13996800, while the sum is 54.

The spelling of 66665066625 in words is "sixty-six billion, six hundred sixty-five million, sixty-six thousand, six hundred twenty-five".