84691639922 has 30 divisors (see below), whose sum is σ = 133154165613. Its totient is φ = 40400572168.

The previous prime is 84691639883. The next prime is 84691639937. The reversal of 84691639922 is 22993619648.

It can be written as a sum of positive squares in 2 ways, for example, as 78310985281 + 6380654641 = 279841^2 + 79879^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=205781.

It is a Duffinian number.

It is an unprimeable number.

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 14 ways as a sum of consecutive naturals, for example, 217716104 + ... + 217716492.

Almost surely, 2^84691639922 is an apocalyptic number.

84691639922 is a deficient number, since it is larger than the sum of its proper divisors (48462525691).

84691639922 is an frugal number, since it uses more digits than its factorization.

84691639922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872 (or 414 counting only the distinct ones).

The product of its digits is 10077696, while the sum is 59.

The spelling of 84691639922 in words is "eighty-four billion, six hundred ninety-one million, six hundred thirty-nine thousand, nine hundred twenty-two".