84647809891 has 16 divisors (see below), whose sum is σ = 90114668800. Its totient is φ = 79284663648.

The previous prime is 84647809879. The next prime is 84647809901. The reversal of 84647809891 is 19890874648.

It is not a de Polignac number, because 84647809891 - 2⁵ = 84647809859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84647809091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1176445 + ... + 1246321.

It is an arithmetic number, because the mean of its divisors is an integer number (5632166800).

Almost surely, 2^84647809891 is an apocalyptic number.

84647809891 is a deficient number, since it is larger than the sum of its proper divisors (5466858909).

84647809891 is a wasteful number, since it uses less digits than its factorization.

84647809891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70618.

The product of its (nonzero) digits is 27869184, while the sum is 64.

The spelling of 84647809891 in words is "eighty-four billion, six hundred forty-seven million, eight hundred nine thousand, eight hundred ninety-one".