66605625 has 40 divisors (see below), whose sum is σ = 123335520. Its totient is φ = 35514000.

The previous prime is 66605599. The next prime is 66605633. The reversal of 66605625 is 52650666.

It is not a de Polignac number, because 66605625 - 2⁸ = 66605369 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66605625.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 14902 + ... + 18848.

It is an arithmetic number, because the mean of its divisors is an integer number (3083388).

Almost surely, 2^66605625 is an apocalyptic number.

It is an amenable number.

66605625 is a deficient number, since it is larger than the sum of its proper divisors (56729895).

66605625 is an equidigital number, since it uses as much as digits as its factorization.

66605625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3976 (or 3955 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 66605625 is about 8161.2269298188. The cubic root of 66605625 is about 405.3563393321.

The spelling of 66605625 in words is "sixty-six million, six hundred five thousand, six hundred twenty-five".