16594139521 has 16 divisors (see below), whose sum is σ = 17618319360. Its totient is φ = 15597101520.

The previous prime is 16594139489. The next prime is 16594139537. The reversal of 16594139521 is 12593149561.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 16594139521 - 2⁵ = 16594139489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16594139581) 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, 361746 + ... + 405028.

It is an arithmetic number, because the mean of its divisors is an integer number (1101144960).

Almost surely, 2^16594139521 is an apocalyptic number.

It is an amenable number.

16594139521 is a deficient number, since it is larger than the sum of its proper divisors (1024179839).

16594139521 is a wasteful number, since it uses less digits than its factorization.

16594139521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43596.

The product of its digits is 291600, while the sum is 46.

The spelling of 16594139521 in words is "sixteen billion, five hundred ninety-four million, one hundred thirty-nine thousand, five hundred twenty-one".