7221664661227 has 4 divisors (see below), whose sum is σ = 7344065757240. Its totient is φ = 7099263565216.

The previous prime is 7221664661207. The next prime is 7221664661291.

7221664661227 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7221664661227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7221664661207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61200547918 + ... + 61200548035.

It is an arithmetic number, because the mean of its divisors is an integer number (1836016439310).

Almost surely, 2^{7221664661227} is an apocalyptic number.

7221664661227 is a deficient number, since it is larger than the sum of its proper divisors (122401096013).

7221664661227 is a wasteful number, since it uses less digits than its factorization.

7221664661227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122401096012.

The product of its digits is 4064256, while the sum is 52.

The spelling of 7221664661227 in words is "seven trillion, two hundred twenty-one billion, six hundred sixty-four million, six hundred sixty-one thousand, two hundred twenty-seven".