16615115065 has 4 divisors (see below), whose sum is σ = 19938138084. Its totient is φ = 13292092048.

The previous prime is 16615115059. The next prime is 16615115071. The reversal of 16615115065 is 56051151661.

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

It is an interprime number because it is at equal distance from previous prime (16615115059) and next prime (16615115071).

It can be written as a sum of positive squares in 2 ways, for example, as 9275423481 + 7339691584 = 96309^2 + 85672^2 .

It is a cyclic number.

It is not a de Polignac number, because 16615115065 - 2³ = 16615115057 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1661511502 + ... + 1661511511.

It is an arithmetic number, because the mean of its divisors is an integer number (4984534521).

Almost surely, 2^16615115065 is an apocalyptic number.

It is an amenable number.

16615115065 is a deficient number, since it is larger than the sum of its proper divisors (3323023019).

16615115065 is an equidigital number, since it uses as much as digits as its factorization.

16615115065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3323023018.

The product of its (nonzero) digits is 27000, while the sum is 37.

The spelling of 16615115065 in words is "sixteen billion, six hundred fifteen million, one hundred fifteen thousand, sixty-five".