866630625 has 40 divisors (see below), whose sum is σ = 1650221760. Its totient is φ = 396168000.

The previous prime is 866630621. The next prime is 866630657. The reversal of 866630625 is 526036668.

It is not a de Polignac number, because 866630625 - 2² = 866630621 is a prime.

It is not an unprimeable number, because it can be changed into a prime (866630621) 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 39 ways as a sum of consecutive naturals, for example, 19890 + ... + 46139.

It is an arithmetic number, because the mean of its divisors is an integer number (41255544).

Almost surely, 2^866630625 is an apocalyptic number.

It is an amenable number.

866630625 is a deficient number, since it is larger than the sum of its proper divisors (783591135).

866630625 is an equidigital number, since it uses as much as digits as its factorization.

866630625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66059 (or 66044 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 42.

The square root of 866630625 is about 29438.5907441236. The cubic root of 866630625 is about 953.4062853389.

The spelling of 866630625 in words is "eight hundred sixty-six million, six hundred thirty thousand, six hundred twenty-five".