1664127902880 has 288 divisors, whose sum is σ = 6014618535744. Its totient is φ = 417543118848.

The previous prime is 1664127902867. The next prime is 1664127902887. The reversal of 1664127902880 is 882097214661.

It is a happy number.

1664127902880 is a `hidden beast` number, since 1 + 66 + 412 + 7 + 90 + 2 + 8 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is not an unprimeable number, because it can be changed into a prime (1664127902887) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 110323819 + ... + 110338901.

It is an arithmetic number, because the mean of its divisors is an integer number (20884092138).

Almost surely, 2^{1664127902880} is an apocalyptic number.

1664127902880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1664127902880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3007309267872).

1664127902880 is an abundant number, since it is smaller than the sum of its proper divisors (4350490632864).

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

1664127902880 is a wasteful number, since it uses less digits than its factorization.

1664127902880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19628 (or 19617 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The spelling of 1664127902880 in words is "one trillion, six hundred sixty-four billion, one hundred twenty-seven million, nine hundred two thousand, eight hundred eighty".