6566165200505 has 4 divisors (see below), whose sum is σ = 7879398240612. Its totient is φ = 5252932160400.

The previous prime is 6566165200457. The next prime is 6566165200537. The reversal of 6566165200505 is 5050025616656.

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 1003458985984 + 5562706214521 = 1001728^2 + 2358539^2 .

It is not a de Polignac number, because 6566165200505 - 2²⁸ = 6565896765049 is a prime.

It is a super-2 number, since 2×6566165200505² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6566165200505.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 656616520046 + ... + 656616520055.

It is an arithmetic number, because the mean of its divisors is an integer number (1969849560153).

Almost surely, 2^{6566165200505} is an apocalyptic number.

It is an amenable number.

6566165200505 is a deficient number, since it is larger than the sum of its proper divisors (1313233040107).

6566165200505 is a wasteful number, since it uses less digits than its factorization.

6566165200505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1313233040106.

The product of its (nonzero) digits is 1620000, while the sum is 47.

The spelling of 6566165200505 in words is "six trillion, five hundred sixty-six billion, one hundred sixty-five million, two hundred thousand, five hundred five".