81604576374 has 16 divisors (see below), whose sum is σ = 163228096512. Its totient is φ = 27198368168.

The previous prime is 81604576373. The next prime is 81604576379. The reversal of 81604576374 is 47367540618.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81604576373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 733014 + ... + 836969.

It is an arithmetic number, because the mean of its divisors is an integer number (10201756032).

Almost surely, 2^81604576374 is an apocalyptic number.

81604576374 is an abundant number, since it is smaller than the sum of its proper divisors (81623520138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81604576374 is a wasteful number, since it uses less digits than its factorization.

81604576374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1578651.

The product of its (nonzero) digits is 3386880, while the sum is 51.

The spelling of 81604576374 in words is "eighty-one billion, six hundred four million, five hundred seventy-six thousand, three hundred seventy-four".