81684708083 has 16 divisors (see below), whose sum is σ = 89537460480. Its totient is φ = 73903356000.

The previous prime is 81684708037. The next prime is 81684708143. The reversal of 81684708083 is 38080748618.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 81684708083 - 2³² = 77389740787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81684708013) by changing a digit.

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, 9236978 + ... + 9245816.

It is an arithmetic number, because the mean of its divisors is an integer number (5596091280).

Almost surely, 2^81684708083 is an apocalyptic number.

81684708083 is a deficient number, since it is larger than the sum of its proper divisors (7852752397).

81684708083 is a wasteful number, since it uses less digits than its factorization.

81684708083 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12778.

The product of its (nonzero) digits is 2064384, while the sum is 53.

The spelling of 81684708083 in words is "eighty-one billion, six hundred eighty-four million, seven hundred eight thousand, eighty-three".