1664231560237 has 2 divisors, whose sum is σ = 1664231560238. Its totient is φ = 1664231560236.

The previous prime is 1664231560223. The next prime is 1664231560247. The reversal of 1664231560237 is 7320651324661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 932327356041 + 731904204196 = 965571^2 + 855514^2 .

It is a cyclic number.

It is not a de Polignac number, because 1664231560237 - 2⁷ = 1664231560109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1664231560217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832115780118 + 832115780119.

It is an arithmetic number, because the mean of its divisors is an integer number (832115780119).

Almost surely, 2^{1664231560237} is an apocalyptic number.

It is an amenable number.

1664231560237 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664231560237 is an equidigital number, since it uses as much as digits as its factorization.

1664231560237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 46.

Adding to 1664231560237 its reverse (7320651324661), we get a palindrome (8984882884898).

The spelling of 1664231560237 in words is "one trillion, six hundred sixty-four billion, two hundred thirty-one million, five hundred sixty thousand, two hundred thirty-seven".