81684707450001 has 16 divisors (see below), whose sum is σ = 109218603196800. Its totient is φ = 54303648006528.

The previous prime is 81684707449861. The next prime is 81684707450057. The reversal of 81684707450001 is 10005470748618.

It is not a de Polignac number, because 81684707450001 - 2¹⁹ = 81684706925713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81684707450701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52454715 + ... + 53989503.

It is an arithmetic number, because the mean of its divisors is an integer number (6826162699800).

Almost surely, 2^{81684707450001} is an apocalyptic number.

It is an amenable number.

81684707450001 is a deficient number, since it is larger than the sum of its proper divisors (27533895746799).

81684707450001 is a wasteful number, since it uses less digits than its factorization.

81684707450001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1584568.

The product of its (nonzero) digits is 1505280, while the sum is 51.

The spelling of 81684707450001 in words is "eighty-one trillion, six hundred eighty-four billion, seven hundred seven million, four hundred fifty thousand, one".