825640911 has 8 divisors (see below), whose sum is σ = 1223171760. Its totient is φ = 550427256.

The previous prime is 825640889. The next prime is 825640919. The reversal of 825640911 is 119046528.

825640911 is a `hidden beast` number, since 8 + 2 + 5 + 640 + 9 + 1 + 1 = 666.

It is not a de Polignac number, because 825640911 - 2⁶ = 825640847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (825640919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15289620 + ... + 15289673.

It is an arithmetic number, because the mean of its divisors is an integer number (152896470).

Almost surely, 2^825640911 is an apocalyptic number.

825640911 is a deficient number, since it is larger than the sum of its proper divisors (397530849).

825640911 is a wasteful number, since it uses less digits than its factorization.

825640911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30579302 (or 30579296 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 825640911 is about 28733.9678951585. The cubic root of 825640911 is about 938.1315347992.

The spelling of 825640911 in words is "eight hundred twenty-five million, six hundred forty thousand, nine hundred eleven".