1664693120 has 32 divisors (see below), whose sum is σ = 3979658520. Its totient is φ = 665876992.

The previous prime is 1664693117. The next prime is 1664693131. The reversal of 1664693120 is 213964661.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1299902 + ... + 1301181.

Almost surely, 2^1664693120 is an apocalyptic number.

1664693120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1664693120 is an abundant number, since it is smaller than the sum of its proper divisors (2314965400).

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

1664693120 is an equidigital number, since it uses as much as digits as its factorization.

1664693120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2601102 (or 2601090 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 1664693120 is about 40800.6509751989. The cubic root of 1664693120 is about 1185.1629369975.

The spelling of 1664693120 in words is "one billion, six hundred sixty-four million, six hundred ninety-three thousand, one hundred twenty".