1664134349 has 2 divisors, whose sum is σ = 1664134350. Its totient is φ = 1664134348.

The previous prime is 1664134327. The next prime is 1664134429. The reversal of 1664134349 is 9434314661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1663824100 + 310249 = 40790^2 + 557^2 .

It is a cyclic number.

It is not a de Polignac number, because 1664134349 - 2¹² = 1664130253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1664139349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832067174 + 832067175.

It is an arithmetic number, because the mean of its divisors is an integer number (832067175).

Almost surely, 2^1664134349 is an apocalyptic number.

It is an amenable number.

1664134349 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664134349 is an equidigital number, since it uses as much as digits as its factorization.

1664134349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 41.

The square root of 1664134349 is about 40793.8028259195. The cubic root of 1664134349 is about 1185.0303182021.

The spelling of 1664134349 in words is "one billion, six hundred sixty-four million, one hundred thirty-four thousand, three hundred forty-nine".