80836020891 has 24 divisors (see below), whose sum is σ = 118815131760. Its totient is φ = 52944731136.

The previous prime is 80836020883. The next prime is 80836020893. The reversal of 80836020891 is 19802063808.

80836020891 is a `hidden beast` number, since 80 + 8 + 360 + 208 + 9 + 1 = 666.

It is not a de Polignac number, because 80836020891 - 2³ = 80836020883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80836020893) 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 23 ways as a sum of consecutive naturals, for example, 833931 + ... + 925803.

It is an arithmetic number, because the mean of its divisors is an integer number (4950630490).

Almost surely, 2^80836020891 is an apocalyptic number.

80836020891 is a deficient number, since it is larger than the sum of its proper divisors (37979110869).

80836020891 is a wasteful number, since it uses less digits than its factorization.

80836020891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93595 (or 93592 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The spelling of 80836020891 in words is "eighty billion, eight hundred thirty-six million, twenty thousand, eight hundred ninety-one".