16580814421 has 4 divisors (see below), whose sum is σ = 16593540832. Its totient is φ = 16568088012.

The previous prime is 16580814413. The next prime is 16580814457. The reversal of 16580814421 is 12441808561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16580814421 - 2³ = 16580814413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16580814401) 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, 6361251 + ... + 6363856.

It is an arithmetic number, because the mean of its divisors is an integer number (4148385208).

Almost surely, 2^16580814421 is an apocalyptic number.

It is an amenable number.

16580814421 is a deficient number, since it is larger than the sum of its proper divisors (12726411).

16580814421 is a wasteful number, since it uses less digits than its factorization.

16580814421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12726410.

The product of its (nonzero) digits is 61440, while the sum is 40.

The spelling of 16580814421 in words is "sixteen billion, five hundred eighty million, eight hundred fourteen thousand, four hundred twenty-one".