6813578525 has 12 divisors (see below), whose sum is σ = 9098748372. Its totient is φ = 5031565440.

The previous prime is 6813578501. The next prime is 6813578537. The reversal of 6813578525 is 5258753186.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 1294128676 + 5519449849 = 35974^2 + 74293^2 .

It is not a de Polignac number, because 6813578525 - 2¹⁰ = 6813577501 is a prime.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 10482104 + ... + 10482753.

It is an arithmetic number, because the mean of its divisors is an integer number (758229031).

Almost surely, 2^6813578525 is an apocalyptic number.

6813578525 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6813578525 is a deficient number, since it is larger than the sum of its proper divisors (2285169847).

6813578525 is a wasteful number, since it uses less digits than its factorization.

6813578525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20964880 (or 20964875 counting only the distinct ones).

The product of its digits is 2016000, while the sum is 50.

The square root of 6813578525 is about 82544.4033535890. The cubic root of 6813578525 is about 1895.7966658877.

The spelling of 6813578525 in words is "six billion, eight hundred thirteen million, five hundred seventy-eight thousand, five hundred twenty-five".