16566363650601 has 6 divisors (see below), whose sum is σ = 23929191939770. Its totient is φ = 11044242433728.

The previous prime is 16566363650567. The next prime is 16566363650651. The reversal of 16566363650601 is 10605636366561.

16566363650601 is a `hidden beast` number, since 16 + 5 + 6 + 63 + 63 + 6 + 506 + 0 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15287318010000 + 1279045640601 = 3909900^2 + 1130949^2 .

It is not a de Polignac number, because 16566363650601 - 2¹⁵ = 16566363617833 is a prime.

It is a super-2 number, since 2×16566363650601² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16566363650651) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 920353536136 + ... + 920353536153.

Almost surely, 2^{16566363650601} is an apocalyptic number.

It is an amenable number.

16566363650601 is a deficient number, since it is larger than the sum of its proper divisors (7362828289169).

16566363650601 is a wasteful number, since it uses less digits than its factorization.

16566363650601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1840707072295 (or 1840707072292 counting only the distinct ones).

The product of its (nonzero) digits is 10497600, while the sum is 54.

The spelling of 16566363650601 in words is "sixteen trillion, five hundred sixty-six billion, three hundred sixty-three million, six hundred fifty thousand, six hundred one".