221666651701511 has 2 divisors, whose sum is σ = 221666651701512. Its totient is φ = 221666651701510.

The previous prime is 221666651701487. The next prime is 221666651701531. The reversal of 221666651701511 is 115107156666122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221666651701511 is a prime.

It is a super-2 number, since 2×221666651701511² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221666651701511.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221666651701531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110833325850755 + 110833325850756.

It is an arithmetic number, because the mean of its divisors is an integer number (110833325850756).

Almost surely, 2^{221666651701511} is an apocalyptic number.

221666651701511 is a deficient number, since it is larger than the sum of its proper divisors (1).

221666651701511 is an equidigital number, since it uses as much as digits as its factorization.

221666651701511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 907200, while the sum is 50.

The spelling of 221666651701511 in words is "two hundred twenty-one trillion, six hundred sixty-six billion, six hundred fifty-one million, seven hundred one thousand, five hundred eleven".