1665275612100 has 72 divisors (see below), whose sum is σ = 4818328794720. Its totient is φ = 444061390080.

The previous prime is 1665275612087. The next prime is 1665275612107. The reversal of 1665275612100 is 12165725661.

It is not an unprimeable number, because it can be changed into a prime (1665275612107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18693264 + ... + 18782136.

It is an arithmetic number, because the mean of its divisors is an integer number (66921233260).

Almost surely, 2^{1665275612100} is an apocalyptic number.

1665275612100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1665275612100 is an abundant number, since it is smaller than the sum of its proper divisors (3153053182620).

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

1665275612100 is a wasteful number, since it uses less digits than its factorization.

1665275612100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151349 (or 151342 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 42.

The spelling of 1665275612100 in words is "one trillion, six hundred sixty-five billion, two hundred seventy-five million, six hundred twelve thousand, one hundred".