6425665 has 8 divisors (see below), whose sum is σ = 7724520. Its totient is φ = 5131392.

The previous prime is 6425663. The next prime is 6425687. The reversal of 6425665 is 5665246.

It can be written as a sum of positive squares in 4 ways, for example, as 2611456 + 3814209 = 1616^2 + 1953^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6425665 - 2¹ = 6425663 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6425665.

It is not an unprimeable number, because it can be changed into a prime (6425663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4341 + ... + 5629.

It is an arithmetic number, because the mean of its divisors is an integer number (965565).

Almost surely, 2^6425665 is an apocalyptic number.

It is an amenable number.

6425665 is a deficient number, since it is larger than the sum of its proper divisors (1298855).

6425665 is a wasteful number, since it uses less digits than its factorization.

6425665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2291.

The product of its digits is 43200, while the sum is 34.

The square root of 6425665 is about 2534.8895439447. The cubic root of 6425665 is about 185.9114022878.

The spelling of 6425665 in words is "six million, four hundred twenty-five thousand, six hundred sixty-five".