80139551821 has 16 divisors (see below), whose sum is σ = 94086881280. Its totient is φ = 66817854720.

The previous prime is 80139551819. The next prime is 80139551837. The reversal of 80139551821 is 12815593108.

It is a cyclic number.

It is not a de Polignac number, because 80139551821 - 2¹ = 80139551819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80139551861) 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, 1061940 + ... + 1134898.

It is an arithmetic number, because the mean of its divisors is an integer number (5880430080).

Almost surely, 2^80139551821 is an apocalyptic number.

It is an amenable number.

80139551821 is a deficient number, since it is larger than the sum of its proper divisors (13947329459).

80139551821 is a wasteful number, since it uses less digits than its factorization.

80139551821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77244.

The product of its (nonzero) digits is 86400, while the sum is 43.

The spelling of 80139551821 in words is "eighty billion, one hundred thirty-nine million, five hundred fifty-one thousand, eight hundred twenty-one".