81365474605 has 16 divisors (see below), whose sum is σ = 97827206400. Its totient is φ = 64966708800.

The previous prime is 81365474573. The next prime is 81365474651. The reversal of 81365474605 is 50647456318.

It is not a de Polignac number, because 81365474605 - 2⁵ = 81365474573 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12909955 + ... + 12916255.

It is an arithmetic number, because the mean of its divisors is an integer number (6114200400).

Almost surely, 2^81365474605 is an apocalyptic number.

It is an amenable number.

81365474605 is a deficient number, since it is larger than the sum of its proper divisors (16461731795).

81365474605 is a wasteful number, since it uses less digits than its factorization.

81365474605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10884.

The product of its (nonzero) digits is 2419200, while the sum is 49.

The spelling of 81365474605 in words is "eighty-one billion, three hundred sixty-five million, four hundred seventy-four thousand, six hundred five".