1664461467649 has 6 divisors (see below), whose sum is σ = 1768130348294. Its totient is φ = 1566551969280.

The previous prime is 1664461467593. The next prime is 1664461467719. The reversal of 1664461467649 is 9467641644661.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1062820788624 + 601640679025 = 1030932^2 + 775655^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1664461467649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1664461465649) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2879690832 + ... + 2879691409.

Almost surely, 2^{1664461467649} is an apocalyptic number.

It is an amenable number.

1664461467649 is a deficient number, since it is larger than the sum of its proper divisors (103668880645).

1664461467649 is an equidigital number, since it uses as much as digits as its factorization.

1664461467649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5759382275 (or 5759382258 counting only the distinct ones).

The product of its digits is 125411328, while the sum is 64.

The spelling of 1664461467649 in words is "one trillion, six hundred sixty-four billion, four hundred sixty-one million, four hundred sixty-seven thousand, six hundred forty-nine".