66860625 has 60 divisors (see below), whose sum is σ = 121198704. Its totient is φ = 32760000.

The previous prime is 66860611. The next prime is 66860641. The reversal of 66860625 is 52606866.

It is not a de Polignac number, because 66860625 - 2⁶ = 66860561 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 316770 + ... + 316980.

Almost surely, 2^66860625 is an apocalyptic number.

66860625 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66860625 is a deficient number, since it is larger than the sum of its proper divisors (54338079).

66860625 is a wasteful number, since it uses less digits than its factorization.

66860625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260 (or 232 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 66860625 is about 8176.8346565159. The cubic root of 66860625 is about 405.8729835550.

The spelling of 66860625 in words is "sixty-six million, eight hundred sixty thousand, six hundred twenty-five".