1664128144 has 20 divisors (see below), whose sum is σ = 3684855424. Its totient is φ = 713197728.

The previous prime is 1664128121. The next prime is 1664128211. The reversal of 1664128144 is 4418214661.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7429032 + ... + 7429255.

Almost surely, 2^1664128144 is an apocalyptic number.

1664128144 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1664128144 is an abundant number, since it is smaller than the sum of its proper divisors (2020727280).

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

1664128144 is a wasteful number, since it uses less digits than its factorization.

1664128144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14858302 (or 14858296 counting only the distinct ones).

The product of its digits is 36864, while the sum is 37.

The square root of 1664128144 is about 40793.7267726301. The cubic root of 1664128144 is about 1185.0288453398.

The spelling of 1664128144 in words is "one billion, six hundred sixty-four million, one hundred twenty-eight thousand, one hundred forty-four".