84640632805 has 4 divisors (see below), whose sum is σ = 101568759372. Its totient is φ = 67712506240.

The previous prime is 84640632751. The next prime is 84640632833. The reversal of 84640632805 is 50823604648.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28717369444 + 55923263361 = 169462^2 + 236481^2 .

It is not a de Polignac number, because 84640632805 - 2²⁹ = 84103761893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 8464063276 + ... + 8464063285.

It is an arithmetic number, because the mean of its divisors is an integer number (25392189843).

Almost surely, 2^84640632805 is an apocalyptic number.

It is an amenable number.

84640632805 is a deficient number, since it is larger than the sum of its proper divisors (16928126567).

84640632805 is a wasteful number, since it uses less digits than its factorization.

84640632805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16928126566.

The product of its (nonzero) digits is 1105920, while the sum is 46.

The spelling of 84640632805 in words is "eighty-four billion, six hundred forty million, six hundred thirty-two thousand, eight hundred five".