82357825581 has 72 divisors (see below), whose sum is σ = 129909661440. Its totient is φ = 50218185600.

The previous prime is 82357825579. The next prime is 82357825633. The reversal of 82357825581 is 18552875328.

82357825581 is a `hidden beast` number, since 8 + 2 + 3 + 5 + 7 + 82 + 558 + 1 = 666.

It is not a de Polignac number, because 82357825581 - 2¹ = 82357825579 is a prime.

It is a super-2 number, since 2×82357825581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82357825531) 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 71 ways as a sum of consecutive naturals, for example, 62344401 + ... + 62345721.

Almost surely, 2^82357825581 is an apocalyptic number.

It is an amenable number.

82357825581 is a deficient number, since it is larger than the sum of its proper divisors (47551835859).

82357825581 is a wasteful number, since it uses less digits than its factorization.

82357825581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2015 (or 1993 counting only the distinct ones).

The product of its digits is 5376000, while the sum is 54.

The spelling of 82357825581 in words is "eighty-two billion, three hundred fifty-seven million, eight hundred twenty-five thousand, five hundred eighty-one".