1664811624 has 32 divisors (see below), whose sum is σ = 4756605120. Its totient is φ = 475660416.

The previous prime is 1664811623. The next prime is 1664811637. The reversal of 1664811624 is 4261184661.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1664811623) 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 7 ways as a sum of consecutive naturals, for example, 4954629 + ... + 4954964.

It is an arithmetic number, because the mean of its divisors is an integer number (148643910).

Almost surely, 2^1664811624 is an apocalyptic number.

1664811624 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1664811624 is an abundant number, since it is smaller than the sum of its proper divisors (3091793496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1664811624 is a wasteful number, since it uses less digits than its factorization.

1664811624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9909609 (or 9909605 counting only the distinct ones).

The product of its digits is 55296, while the sum is 39.

The square root of 1664811624 is about 40802.1031810861. The cubic root of 1664811624 is about 1185.1910589407.

The spelling of 1664811624 in words is "one billion, six hundred sixty-four million, eight hundred eleven thousand, six hundred twenty-four".