16529940865 has 4 divisors (see below), whose sum is σ = 19835929044. Its totient is φ = 13223952688.

The previous prime is 16529940859. The next prime is 16529940877. The reversal of 16529940865 is 56804992561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56804992561 = 47 ⋅1208616863.

It can be written as a sum of positive squares in 2 ways, for example, as 5813757504 + 10716183361 = 76248^2 + 103519^2 .

It is a cyclic number.

It is not a de Polignac number, because 16529940865 - 2⁷ = 16529940737 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1652994082 + ... + 1652994091.

It is an arithmetic number, because the mean of its divisors is an integer number (4958982261).

Almost surely, 2^16529940865 is an apocalyptic number.

It is an amenable number.

16529940865 is a deficient number, since it is larger than the sum of its proper divisors (3305988179).

16529940865 is an equidigital number, since it uses as much as digits as its factorization.

16529940865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3305988178.

The product of its (nonzero) digits is 4665600, while the sum is 55.

The spelling of 16529940865 in words is "sixteen billion, five hundred twenty-nine million, nine hundred forty thousand, eight hundred sixty-five".