16012528509 has 4 divisors (see below), whose sum is σ = 21350038016. Its totient is φ = 10675019004.

The previous prime is 16012528501. The next prime is 16012528513. The reversal of 16012528509 is 90582521061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 16012528509 - 2³ = 16012528501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16012528501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2668754749 + ... + 2668754754.

It is an arithmetic number, because the mean of its divisors is an integer number (5337509504).

Almost surely, 2^16012528509 is an apocalyptic number.

It is an amenable number.

16012528509 is a deficient number, since it is larger than the sum of its proper divisors (5337509507).

16012528509 is an equidigital number, since it uses as much as digits as its factorization.

16012528509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5337509506.

The product of its (nonzero) digits is 43200, while the sum is 39.

The spelling of 16012528509 in words is "sixteen billion, twelve million, five hundred twenty-eight thousand, five hundred nine".