1664224660 has 24 divisors (see below), whose sum is σ = 3994139520. Its totient is φ = 570591264.

The previous prime is 1664224651. The next prime is 1664224669. The reversal of 1664224660 is 664224661.

It is an interprime number because it is at equal distance from previous prime (1664224651) and next prime (1664224669).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664224669) 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, 5943520 + ... + 5943799.

It is an arithmetic number, because the mean of its divisors is an integer number (166422480).

Almost surely, 2^1664224660 is an apocalyptic number.

1664224660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1664224660 is an abundant number, since it is smaller than the sum of its proper divisors (2329914860).

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

1664224660 is a wasteful number, since it uses less digits than its factorization.

1664224660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11887335 (or 11887333 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 37.

The square root of 1664224660 is about 40794.9097314849. The cubic root of 1664224660 is about 1185.0517546399.

Subtracting from 1664224660 its reverse (664224661), we obtain a palindrome (999999999).

The spelling of 1664224660 in words is "one billion, six hundred sixty-four million, two hundred twenty-four thousand, six hundred sixty".