16012531809 has 6 divisors (see below), whose sum is σ = 23129212626. Its totient is φ = 10675021200.

The previous prime is 16012531783. The next prime is 16012531811. The reversal of 16012531809 is 90813521061.

It can be written as a sum of positive squares in only one way, i.e., 8944430625 + 7068101184 = 94575^2 + 84072^2 .

It is not a de Polignac number, because 16012531809 - 2¹¹ = 16012529761 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16012531889) 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 5 ways as a sum of consecutive naturals, for example, 889585092 + ... + 889585109.

It is an arithmetic number, because the mean of its divisors is an integer number (3854868771).

Almost surely, 2^16012531809 is an apocalyptic number.

It is an amenable number.

16012531809 is a deficient number, since it is larger than the sum of its proper divisors (7116680817).

16012531809 is a wasteful number, since it uses less digits than its factorization.

16012531809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1779170207 (or 1779170204 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The spelling of 16012531809 in words is "sixteen billion, twelve million, five hundred thirty-one thousand, eight hundred nine".