66122206565201 has 16 divisors (see below), whose sum is σ = 68233812103296. Its totient is φ = 64043801517696.

The previous prime is 66122206565179. The next prime is 66122206565231. The reversal of 66122206565201 is 10256560222166.

It is a cyclic number.

It is not a de Polignac number, because 66122206565201 - 2²² = 66122202370897 is a prime.

It is a super-2 number, since 2×66122206565201² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66122206565231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36020 + ... + 11499813.

It is an arithmetic number, because the mean of its divisors is an integer number (4264613256456).

Almost surely, 2^{66122206565201} is an apocalyptic number.

It is an amenable number.

66122206565201 is a deficient number, since it is larger than the sum of its proper divisors (2111605538095).

66122206565201 is a wasteful number, since it uses less digits than its factorization.

66122206565201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11537272.

The product of its (nonzero) digits is 518400, while the sum is 44.

Adding to 66122206565201 its reverse (10256560222166), we get a palindrome (76378766787367).

The spelling of 66122206565201 in words is "sixty-six trillion, one hundred twenty-two billion, two hundred six million, five hundred sixty-five thousand, two hundred one".