1664605037 has 2 divisors, whose sum is σ = 1664605038. Its totient is φ = 1664605036.

The previous prime is 1664605001. The next prime is 1664605039. The reversal of 1664605037 is 7305064661.

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., 1519908196 + 144696841 = 38986^2 + 12029^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1664605037 is a prime.

Together with 1664605039, 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 (1664605039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832302518 + 832302519.

It is an arithmetic number, because the mean of its divisors is an integer number (832302519).

Almost surely, 2^1664605037 is an apocalyptic number.

It is an amenable number.

1664605037 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664605037 is an equidigital number, since it uses as much as digits as its factorization.

1664605037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 1664605037 is about 40799.5715296129. The cubic root of 1664605037 is about 1185.1420333352.

Adding to 1664605037 its reverse (7305064661), we get a palindrome (8969669698).

The spelling of 1664605037 in words is "one billion, six hundred sixty-four million, six hundred five thousand, thirty-seven".