81811483374 has 64 divisors (see below), whose sum is σ = 173434060800. Its totient is φ = 25655613408.

The previous prime is 81811483361. The next prime is 81811483433. The reversal of 81811483374 is 47338411818.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35771259 + ... + 35773545.

It is an arithmetic number, because the mean of its divisors is an integer number (2709907200).

Almost surely, 2^81811483374 is an apocalyptic number.

81811483374 is an abundant number, since it is smaller than the sum of its proper divisors (91622577426).

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

81811483374 is a wasteful number, since it uses less digits than its factorization.

81811483374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4357.

The product of its digits is 516096, while the sum is 48.

The spelling of 81811483374 in words is "eighty-one billion, eight hundred eleven million, four hundred eighty-three thousand, three hundred seventy-four".