1665888628512 has 96 divisors (see below), whose sum is σ = 4632546183552. Its totient is φ = 522365825024.

The previous prime is 1665888628493. The next prime is 1665888628513. The reversal of 1665888628512 is 2158268885661.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (1665888628513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2961253 + ... + 3478619.

It is an arithmetic number, because the mean of its divisors is an integer number (48255689412).

Almost surely, 2^{1665888628512} is an apocalyptic number.

1665888628512 is a gapful number since it is divisible by the number (12) 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 1665888628512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2316273091776).

1665888628512 is an abundant number, since it is smaller than the sum of its proper divisors (2966657555040).

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

1665888628512 is a wasteful number, since it uses less digits than its factorization.

1665888628512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519370 (or 519362 counting only the distinct ones).

The product of its digits is 88473600, while the sum is 66.

The spelling of 1665888628512 in words is "one trillion, six hundred sixty-five billion, eight hundred eighty-eight million, six hundred twenty-eight thousand, five hundred twelve".