1641664264241 has 2 divisors, whose sum is σ = 1641664264242. Its totient is φ = 1641664264240.

The previous prime is 1641664264231. The next prime is 1641664264283. The reversal of 1641664264241 is 1424624661461.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1636403808400 + 5260455841 = 1279220^2 + 72529^2 .

It is a cyclic number.

It is not a de Polignac number, because 1641664264241 - 2²² = 1641660069937 is a prime.

It is not a weakly prime, because it can be changed into another prime (1641664264231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820832132120 + 820832132121.

It is an arithmetic number, because the mean of its divisors is an integer number (820832132121).

Almost surely, 2^{1641664264241} is an apocalyptic number.

It is an amenable number.

1641664264241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641664264241 is an equidigital number, since it uses as much as digits as its factorization.

1641664264241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1327104, while the sum is 47.

The spelling of 1641664264241 in words is "one trillion, six hundred forty-one billion, six hundred sixty-four million, two hundred sixty-four thousand, two hundred forty-one".