6525128385 has 12 divisors (see below), whose sum is σ = 11310222612. Its totient is φ = 3480068448.

The previous prime is 6525128327. The next prime is 6525128429. The reversal of 6525128385 is 5838215256.

6525128385 is a `hidden beast` number, since 6 + 52 + 512 + 8 + 3 + 85 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5016038976 + 1509089409 = 70824^2 + 38847^2 .

It is not a de Polignac number, because 6525128385 - 2¹⁷ = 6524997313 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 145002853 = 6525128385 / (6 + 5 + 2 + 5 + 1 + 2 + 8 + 3 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 6525128385.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72501382 + ... + 72501471.

It is an arithmetic number, because the mean of its divisors is an integer number (942518551).

Almost surely, 2^6525128385 is an apocalyptic number.

It is an amenable number.

6525128385 is a deficient number, since it is larger than the sum of its proper divisors (4785094227).

6525128385 is a wasteful number, since it uses less digits than its factorization.

6525128385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145002864 (or 145002861 counting only the distinct ones).

The product of its digits is 576000, while the sum is 45.

The square root of 6525128385 is about 80778.2667863083. The cubic root of 6525128385 is about 1868.6574084764.

It can be divided in two parts, 65251 and 28385, that added together give a square (93636 = 306²).

The spelling of 6525128385 in words is "six billion, five hundred twenty-five million, one hundred twenty-eight thousand, three hundred eighty-five".