16809522745 has 16 divisors (see below), whose sum is σ = 21241566720. Its totient is φ = 12744921024.

The previous prime is 16809522721. The next prime is 16809522757. The reversal of 16809522745 is 54722590861.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16809522745 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 657969 + ... + 683038.

It is an arithmetic number, because the mean of its divisors is an integer number (1327597920).

Almost surely, 2^16809522745 is an apocalyptic number.

It is an amenable number.

16809522745 is a deficient number, since it is larger than the sum of its proper divisors (4432043975).

16809522745 is a wasteful number, since it uses less digits than its factorization.

16809522745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1341144.

The product of its (nonzero) digits is 1209600, while the sum is 49.

The spelling of 16809522745 in words is "sixteen billion, eight hundred nine million, five hundred twenty-two thousand, seven hundred forty-five".