1664361011 has 16 divisors (see below), whose sum is σ = 1769493600. Its totient is φ = 1562668800.

The previous prime is 1664360989. The next prime is 1664361043. The reversal of 1664361011 is 1101634661.

It is a cyclic number.

It is not a de Polignac number, because 1664361011 - 2⁶ = 1664360947 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1664351011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 391445 + ... + 395673.

It is an arithmetic number, because the mean of its divisors is an integer number (110593350).

Almost surely, 2^1664361011 is an apocalyptic number.

1664361011 is a deficient number, since it is larger than the sum of its proper divisors (105132589).

1664361011 is a wasteful number, since it uses less digits than its factorization.

1664361011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4630.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 1664361011 is about 40796.5808738919. The cubic root of 1664361011 is about 1185.0841177743.

Adding to 1664361011 its reverse (1101634661), we get a palindrome (2765995672).

The spelling of 1664361011 in words is "one billion, six hundred sixty-four million, three hundred sixty-one thousand, eleven".