1664870653824 has 256 divisors, whose sum is σ = 5353159104000. Its totient is φ = 447546654720.

The previous prime is 1664870653727. The next prime is 1664870653907. The reversal of 1664870653824 is 4283560784661.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 241317127 + ... + 241324025.

It is an arithmetic number, because the mean of its divisors is an integer number (20910777750).

Almost surely, 2^{1664870653824} is an apocalyptic number.

1664870653824 is a gapful number since it is divisible by the number (14) 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 1664870653824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2676579552000).

1664870653824 is an abundant number, since it is smaller than the sum of its proper divisors (3688288450176).

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

1664870653824 is a wasteful number, since it uses less digits than its factorization.

1664870653824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12221 (or 12209 counting only the distinct ones).

The product of its (nonzero) digits is 46448640, while the sum is 60.

The spelling of 1664870653824 in words is "one trillion, six hundred sixty-four billion, eight hundred seventy million, six hundred fifty-three thousand, eight hundred twenty-four".