1664707469 has 2 divisors, whose sum is σ = 1664707470. Its totient is φ = 1664707468.

The previous prime is 1664707459. The next prime is 1664707483. The reversal of 1664707469 is 9647074661.

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., 1456338244 + 208369225 = 38162^2 + 14435^2 .

It is a cyclic number.

It is not a de Polignac number, because 1664707469 - 2²⁴ = 1647930253 is a prime.

It is a super-2 number, since 2×1664707469² = 5542501914688771922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1664707459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832353734 + 832353735.

It is an arithmetic number, because the mean of its divisors is an integer number (832353735).

Almost surely, 2^1664707469 is an apocalyptic number.

It is an amenable number.

1664707469 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664707469 is an equidigital number, since it uses as much as digits as its factorization.

1664707469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1524096, while the sum is 50.

The square root of 1664707469 is about 40800.8268176026. The cubic root of 1664707469 is about 1185.1663422005.

The spelling of 1664707469 in words is "one billion, six hundred sixty-four million, seven hundred seven thousand, four hundred sixty-nine".