1664045683 has 4 divisors (see below), whose sum is σ = 1717724608. Its totient is φ = 1610366760.

The previous prime is 1664045681. The next prime is 1664045749. The reversal of 1664045683 is 3865404661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3865404661 = 25469 ⋅151769.

It is a cyclic number.

It is not a de Polignac number, because 1664045683 - 2¹ = 1664045681 is a prime.

It is a super-2 number, since 2×1664045683² = 5538096070221872978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1664045681) 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 3 ways as a sum of consecutive naturals, for example, 26839416 + ... + 26839477.

It is an arithmetic number, because the mean of its divisors is an integer number (429431152).

Almost surely, 2^1664045683 is an apocalyptic number.

1664045683 is a deficient number, since it is larger than the sum of its proper divisors (53678925).

1664045683 is an equidigital number, since it uses as much as digits as its factorization.

1664045683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53678924.

The product of its (nonzero) digits is 414720, while the sum is 43.

The square root of 1664045683 is about 40792.7160532368. The cubic root of 1664045683 is about 1185.0092714711.

The spelling of 1664045683 in words is "one billion, six hundred sixty-four million, forty-five thousand, six hundred eighty-three".