81683246904 has 32 divisors (see below), whose sum is σ = 233380705920. Its totient is φ = 23338070496.

The previous prime is 81683246873. The next prime is 81683246933. The reversal of 81683246904 is 40964238618.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243104734 + ... + 243105069.

It is an arithmetic number, because the mean of its divisors is an integer number (7293147060).

Almost surely, 2^81683246904 is an apocalyptic number.

81683246904 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

81683246904 is an abundant number, since it is smaller than the sum of its proper divisors (151697459016).

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

81683246904 is a wasteful number, since it uses less digits than its factorization.

81683246904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486209819 (or 486209815 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 51.

The spelling of 81683246904 in words is "eighty-one billion, six hundred eighty-three million, two hundred forty-six thousand, nine hundred four".