81822057612534 has 40 divisors (see below), whose sum is σ = 194126842577448. Its totient is φ = 25669665132480.

The previous prime is 81822057612521. The next prime is 81822057612553. The reversal of 81822057612534 is 43521675022818.

It is a happy number.

81822057612534 is a `hidden beast` number, since 8 + 1 + 8 + 2 + 2 + 0 + 576 + 12 + 53 + 4 = 666.

It is a super-2 number, since 2×81822057612534² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14855127532 + ... + 14855133039.

Almost surely, 2^{81822057612534} is an apocalyptic number.

81822057612534 is an abundant number, since it is smaller than the sum of its proper divisors (112304784964914).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81822057612534 is a wasteful number, since it uses less digits than its factorization.

81822057612534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29710260602 (or 29710260593 counting only the distinct ones).

The product of its (nonzero) digits is 6451200, while the sum is 54.

The spelling of 81822057612534 in words is "eighty-one trillion, eight hundred twenty-two billion, fifty-seven million, six hundred twelve thousand, five hundred thirty-four".