16565006266 has 4 divisors (see below), whose sum is σ = 24847509402. Its totient is φ = 8282503132.

The previous prime is 16565006243. The next prime is 16565006267. The reversal of 16565006266 is 66260056561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66260056561 = 6299 ⋅10519139.

It can be written as a sum of positive squares in only one way, i.e., 16564977025 + 29241 = 128705^2 + 171^2 .

It is not an unprimeable number, because it can be changed into a prime (16565006267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4141251565 + ... + 4141251568.

Almost surely, 2^16565006266 is an apocalyptic number.

16565006266 is a deficient number, since it is larger than the sum of its proper divisors (8282503136).

16565006266 is an equidigital number, since it uses as much as digits as its factorization.

16565006266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8282503135.

The product of its (nonzero) digits is 388800, while the sum is 43.

The spelling of 16565006266 in words is "sixteen billion, five hundred sixty-five million, six thousand, two hundred sixty-six".