80581406021 has 4 divisors (see below), whose sum is σ = 81685260972. Its totient is φ = 79477551072.

The previous prime is 80581405987. The next prime is 80581406029. The reversal of 80581406021 is 12060418508.

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 61709515396 + 18871890625 = 248414^2 + 137375^2 .

It is a cyclic number.

It is not a de Polignac number, because 80581406021 - 2¹⁰ = 80581404997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80581406029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 551927366 + ... + 551927511.

It is an arithmetic number, because the mean of its divisors is an integer number (20421315243).

Almost surely, 2^80581406021 is an apocalyptic number.

It is an amenable number.

80581406021 is a deficient number, since it is larger than the sum of its proper divisors (1103854951).

80581406021 is a wasteful number, since it uses less digits than its factorization.

80581406021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103854950.

The product of its (nonzero) digits is 15360, while the sum is 35.

The spelling of 80581406021 in words is "eighty billion, five hundred eighty-one million, four hundred six thousand, twenty-one".