16565501050666 has 4 divisors (see below), whose sum is σ = 24848251576002. Its totient is φ = 8282750525332.

The previous prime is 16565501050649. The next prime is 16565501050667. The reversal of 16565501050666 is 66605010556561.

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

It can be written as a sum of positive squares in only one way, i.e., 16538626366441 + 26874684225 = 4066771^2 + 163935^2 .

It is a super-3 number, since 3×16565501050666³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (16565501050667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4141375262665 + ... + 4141375262668.

Almost surely, 2^{16565501050666} is an apocalyptic number.

16565501050666 is a deficient number, since it is larger than the sum of its proper divisors (8282750525336).

16565501050666 is an equidigital number, since it uses as much as digits as its factorization.

16565501050666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8282750525335.

The product of its (nonzero) digits is 4860000, while the sum is 52.

The spelling of 16565501050666 in words is "sixteen trillion, five hundred sixty-five billion, five hundred one million, fifty thousand, six hundred sixty-six".