16864687009 has 4 divisors (see below), whose sum is σ = 16879625860. Its totient is φ = 16849748160.

The previous prime is 16864687001. The next prime is 16864687043. The reversal of 16864687009 is 90078646861.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10532506384 + 6332180625 = 102628^2 + 79575^2 .

It is a cyclic number.

It is not a de Polignac number, because 16864687009 - 2³ = 16864687001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16864687001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7467732 + ... + 7469989.

It is an arithmetic number, because the mean of its divisors is an integer number (4219906465).

Almost surely, 2^16864687009 is an apocalyptic number.

It is an amenable number.

16864687009 is a deficient number, since it is larger than the sum of its proper divisors (14938851).

16864687009 is a wasteful number, since it uses less digits than its factorization.

16864687009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14938850.

The product of its (nonzero) digits is 3483648, while the sum is 55.

The spelling of 16864687009 in words is "sixteen billion, eight hundred sixty-four million, six hundred eighty-seven thousand, nine".