16205326509 has 16 divisors (see below), whose sum is σ = 21995735040. Its totient is φ = 10609608240.

The previous prime is 16205326471. The next prime is 16205326513. The reversal of 16205326509 is 90562350261.

It is a de Polignac number, because none of the positive numbers 2^k-16205326509 is a prime.

It is a super-2 number, since 2×16205326509² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16205326559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129214 + ... + 221600.

It is an arithmetic number, because the mean of its divisors is an integer number (1374733440).

Almost surely, 2^16205326509 is an apocalyptic number.

It is an amenable number.

16205326509 is a deficient number, since it is larger than the sum of its proper divisors (5790408531).

16205326509 is an equidigital number, since it uses as much as digits as its factorization.

16205326509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93440.

The product of its (nonzero) digits is 97200, while the sum is 39.

The spelling of 16205326509 in words is "sixteen billion, two hundred five million, three hundred twenty-six thousand, five hundred nine".