65666425 has 24 divisors (see below), whose sum is σ = 89860320. Its totient is φ = 47203200.

The previous prime is 65666423. The next prime is 65666431. The reversal of 65666425 is 52466656.

It is not a de Polignac number, because 65666425 - 2¹ = 65666423 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65666423) 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 23 ways as a sum of consecutive naturals, for example, 23134 + ... + 25816.

It is an arithmetic number, because the mean of its divisors is an integer number (3744180).

Almost surely, 2^65666425 is an apocalyptic number.

It is an amenable number.

65666425 is a deficient number, since it is larger than the sum of its proper divisors (24193895).

65666425 is a wasteful number, since it uses less digits than its factorization.

65666425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2793 (or 2788 counting only the distinct ones).

The product of its digits is 259200, while the sum is 40.

The square root of 65666425 is about 8103.4822761576. The cubic root of 65666425 is about 403.4420151231.

It can be divided in two parts, 656 and 66425, that added together give a square (67081 = 259²).

The spelling of 65666425 in words is "sixty-five million, six hundred sixty-six thousand, four hundred twenty-five".