81930358268522 has 16 divisors (see below), whose sum is σ = 123035227427112. Its totient is φ = 40918628399040.

The previous prime is 81930358268519. The next prime is 81930358268527. The reversal of 81930358268522 is 22586285303918.

It is a Cunningham number, because it is equal to 9051539²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 81930358268521 + 1 = 9051539^2 + 1^2 .

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (81930358268527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9865808 + ... + 16161524.

Almost surely, 2^{81930358268522} is an apocalyptic number.

81930358268522 is a deficient number, since it is larger than the sum of its proper divisors (41104869158590).

81930358268522 is a wasteful number, since it uses less digits than its factorization.

81930358268522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6303113.

The product of its (nonzero) digits is 49766400, while the sum is 62.

The spelling of 81930358268522 in words is "eighty-one trillion, nine hundred thirty billion, three hundred fifty-eight million, two hundred sixty-eight thousand, five hundred twenty-two".