80404043521 has 4 divisors (see below), whose sum is σ = 80406026452. Its totient is φ = 80402060592.

The previous prime is 80404043519. The next prime is 80404043543. The reversal of 80404043521 is 12534040408.

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 31634179600 + 48769863921 = 177860^2 + 220839^2 .

It is a cyclic number.

It is not a de Polignac number, because 80404043521 - 2¹ = 80404043519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80404043021) 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, 929346 + ... + 1012171.

It is an arithmetic number, because the mean of its divisors is an integer number (20101506613).

Almost surely, 2^80404043521 is an apocalyptic number.

It is an amenable number.

80404043521 is a deficient number, since it is larger than the sum of its proper divisors (1982931).

80404043521 is a wasteful number, since it uses less digits than its factorization.

80404043521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1982930.

The product of its (nonzero) digits is 15360, while the sum is 31.

Adding to 80404043521 its reverse (12534040408), we get a palindrome (92938083929).

The spelling of 80404043521 in words is "eighty billion, four hundred four million, forty-three thousand, five hundred twenty-one".