825660970831 has 4 divisors (see below), whose sum is σ = 827839496200. Its totient is φ = 823482445464.

The previous prime is 825660970829. The next prime is 825660970847. The reversal of 825660970831 is 138079066528.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 825660970831 - 2¹ = 825660970829 is a prime.

It is a super-2 number, since 2×825660970831² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (825660070831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1089262116 + ... + 1089262873.

It is an arithmetic number, because the mean of its divisors is an integer number (206959874050).

Almost surely, 2^825660970831 is an apocalyptic number.

825660970831 is a deficient number, since it is larger than the sum of its proper divisors (2178525369).

825660970831 is a wasteful number, since it uses less digits than its factorization.

825660970831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2178525368.

The product of its (nonzero) digits is 4354560, while the sum is 55.

The spelling of 825660970831 in words is "eight hundred twenty-five billion, six hundred sixty million, nine hundred seventy thousand, eight hundred thirty-one".