16587337580321 has 4 divisors (see below), whose sum is σ = 16587346223892. Its totient is φ = 16587328936752.

The previous prime is 16587337580299. The next prime is 16587337580369. The reversal of 16587337580321 is 12308573378561.

16587337580321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 10592675020321 + 5994662560000 = 3254639^2 + 2448400^2 .

It is a cyclic number.

It is not a de Polignac number, because 16587337580321 - 2⁶ = 16587337580257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16587337580381) 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, 7886 + ... + 5759751.

It is an arithmetic number, because the mean of its divisors is an integer number (4146836555973).

Almost surely, 2^{16587337580321} is an apocalyptic number.

It is an amenable number.

16587337580321 is a deficient number, since it is larger than the sum of its proper divisors (8643571).

16587337580321 is an equidigital number, since it uses as much as digits as its factorization.

16587337580321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8643570.

The product of its (nonzero) digits is 25401600, while the sum is 59.

The spelling of 16587337580321 in words is "sixteen trillion, five hundred eighty-seven billion, three hundred thirty-seven million, five hundred eighty thousand, three hundred twenty-one".