1664646311 has 8 divisors (see below), whose sum is σ = 1683357120. Its totient is φ = 1646030848.

The previous prime is 1664646283. The next prime is 1664646331. The reversal of 1664646311 is 1136464661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1664646311 - 2³⁰ = 590904487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664646331) 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 in 7 ways as a sum of consecutive naturals, for example, 11570 + ... + 58848.

It is an arithmetic number, because the mean of its divisors is an integer number (210419640).

Almost surely, 2^1664646311 is an apocalyptic number.

1664646311 is a deficient number, since it is larger than the sum of its proper divisors (18710809).

1664646311 is a wasteful number, since it uses less digits than its factorization.

1664646311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47673.

The product of its digits is 62208, while the sum is 38.

The square root of 1664646311 is about 40800.0773406130. The cubic root of 1664646311 is about 1185.1518284812.

The spelling of 1664646311 in words is "one billion, six hundred sixty-four million, six hundred forty-six thousand, three hundred eleven".