81842918583 has 32 divisors (see below), whose sum is σ = 112818204864. Its totient is φ = 52746550272.

The previous prime is 81842918519. The next prime is 81842918587. The reversal of 81842918583 is 38581924818.

It is not a de Polignac number, because 81842918583 - 2⁶ = 81842918519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81842918587) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14076385 + ... + 14082197.

It is an arithmetic number, because the mean of its divisors is an integer number (3525568902).

Almost surely, 2^81842918583 is an apocalyptic number.

81842918583 is a deficient number, since it is larger than the sum of its proper divisors (30975286281).

81842918583 is a wasteful number, since it uses less digits than its factorization.

81842918583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7155.

The product of its digits is 4423680, while the sum is 57.

The spelling of 81842918583 in words is "eighty-one billion, eight hundred forty-two million, nine hundred eighteen thousand, five hundred eighty-three".