15516320009 has 4 divisors (see below), whose sum is σ = 15532602516. Its totient is φ = 15500037504.

The previous prime is 15516319997. The next prime is 15516320023. The reversal of 15516320009 is 90002361551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90002361551 = 109 ⋅825709739.

It can be written as a sum of positive squares in 2 ways, for example, as 8784937984 + 6731382025 = 93728^2 + 82045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15516320009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15516320069) 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, 8139824 + ... + 8141729.

It is an arithmetic number, because the mean of its divisors is an integer number (3883150629).

Almost surely, 2^15516320009 is an apocalyptic number.

It is an amenable number.

15516320009 is a deficient number, since it is larger than the sum of its proper divisors (16282507).

15516320009 is an equidigital number, since it uses as much as digits as its factorization.

15516320009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16282506.

The product of its (nonzero) digits is 8100, while the sum is 32.

The spelling of 15516320009 in words is "fifteen billion, five hundred sixteen million, three hundred twenty thousand, nine".