825665676871 has 16 divisors (see below), whose sum is σ = 953895896064. Its totient is φ = 700025219424.

The previous prime is 825665676827. The next prime is 825665676887. The reversal of 825665676871 is 178676566528.

It is a cyclic number.

It is not a de Polignac number, because 825665676871 - 2⁷ = 825665676743 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 825665676797 and 825665676806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (825665670871) 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 15 ways as a sum of consecutive naturals, for example, 354975 + ... + 1333168.

It is an arithmetic number, because the mean of its divisors is an integer number (59618493504).

Almost surely, 2^825665676871 is an apocalyptic number.

825665676871 is a deficient number, since it is larger than the sum of its proper divisors (128230219193).

825665676871 is a wasteful number, since it uses less digits than its factorization.

825665676871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1688910.

The product of its digits is 203212800, while the sum is 67.

The spelling of 825665676871 in words is "eight hundred twenty-five billion, six hundred sixty-five million, six hundred seventy-six thousand, eight hundred seventy-one".