81636874606 has 32 divisors (see below), whose sum is σ = 141587619840. Its totient is φ = 34577928000.

The previous prime is 81636874541. The next prime is 81636874633. The reversal of 81636874606 is 60647863618.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2865331 + ... + 2893681.

It is an arithmetic number, because the mean of its divisors is an integer number (4424613120).

Almost surely, 2^81636874606 is an apocalyptic number.

81636874606 is a deficient number, since it is larger than the sum of its proper divisors (59950745234).

81636874606 is a wasteful number, since it uses less digits than its factorization.

81636874606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30760.

The product of its (nonzero) digits is 6967296, while the sum is 55.

The spelling of 81636874606 in words is "eighty-one billion, six hundred thirty-six million, eight hundred seventy-four thousand, six hundred six".