1664354246237 has 2 divisors, whose sum is σ = 1664354246238. Its totient is φ = 1664354246236.

The previous prime is 1664354246221. The next prime is 1664354246239. The reversal of 1664354246237 is 7326424534661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 934433488921 + 729920757316 = 966661^2 + 854354^2 .

It is a cyclic number.

It is not a de Polignac number, because 1664354246237 - 2⁴ = 1664354246221 is a prime.

Together with 1664354246239, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1664354246239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832177123118 + 832177123119.

It is an arithmetic number, because the mean of its divisors is an integer number (832177123119).

Almost surely, 2^{1664354246237} is an apocalyptic number.

It is an amenable number.

1664354246237 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664354246237 is an equidigital number, since it uses as much as digits as its factorization.

1664354246237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17418240, while the sum is 53.

The spelling of 1664354246237 in words is "one trillion, six hundred sixty-four billion, three hundred fifty-four million, two hundred forty-six thousand, two hundred thirty-seven".