825866499631 has 2 divisors, whose sum is σ = 825866499632. Its totient is φ = 825866499630.

The previous prime is 825866499629. The next prime is 825866499677. The reversal of 825866499631 is 136994668528.

825866499631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 825866499631 - 2¹ = 825866499629 is a prime.

It is a super-2 number, since 2×825866499631² (a number of 25 digits) contains 22 as substring.

Together with 825866499629, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (825866491631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412933249815 + 412933249816.

It is an arithmetic number, because the mean of its divisors is an integer number (412933249816).

Almost surely, 2^825866499631 is an apocalyptic number.

825866499631 is a deficient number, since it is larger than the sum of its proper divisors (1).

825866499631 is an equidigital number, since it uses as much as digits as its factorization.

825866499631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 134369280, while the sum is 67.

The spelling of 825866499631 in words is "eight hundred twenty-five billion, eight hundred sixty-six million, four hundred ninety-nine thousand, six hundred thirty-one".