16565115001 has 4 divisors (see below), whose sum is σ = 16565965812. Its totient is φ = 16564264192.

The previous prime is 16565114899. The next prime is 16565115029. The reversal of 16565115001 is 10051156561.

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 851238976 + 15713876025 = 29176^2 + 125355^2 .

It is a cyclic number.

It is not a de Polignac number, because 16565115001 - 2⁷ = 16565114873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16565115071) 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, 395500 + ... + 435373.

It is an arithmetic number, because the mean of its divisors is an integer number (4141491453).

Almost surely, 2^16565115001 is an apocalyptic number.

It is an amenable number.

16565115001 is a deficient number, since it is larger than the sum of its proper divisors (850811).

16565115001 is an equidigital number, since it uses as much as digits as its factorization.

16565115001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850810.

The product of its (nonzero) digits is 4500, while the sum is 31.

The spelling of 16565115001 in words is "sixteen billion, five hundred sixty-five million, one hundred fifteen thousand, one".