81826405927 has 4 divisors (see below), whose sum is σ = 93515892496. Its totient is φ = 70136919360.

The previous prime is 81826405909. The next prime is 81826405931. The reversal of 81826405927 is 72950462818.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81826405927 - 2²³ = 81818017319 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81826405937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5844743274 + ... + 5844743287.

It is an arithmetic number, because the mean of its divisors is an integer number (23378973124).

Almost surely, 2^81826405927 is an apocalyptic number.

81826405927 is a deficient number, since it is larger than the sum of its proper divisors (11689486569).

81826405927 is a wasteful number, since it uses less digits than its factorization.

81826405927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11689486568.

The product of its (nonzero) digits is 1935360, while the sum is 52.

The spelling of 81826405927 in words is "eighty-one billion, eight hundred twenty-six million, four hundred five thousand, nine hundred twenty-seven".