1665645552200 has 48 divisors (see below), whose sum is σ = 4425858185280. Its totient is φ = 571078474560.

The previous prime is 1665645552191. The next prime is 1665645552203. The reversal of 1665645552200 is 22555465661.

It is not an unprimeable number, because it can be changed into a prime (1665645552203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 594872012 + ... + 594874811.

It is an arithmetic number, because the mean of its divisors is an integer number (92205378860).

Almost surely, 2^{1665645552200} is an apocalyptic number.

1665645552200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1665645552200 is an abundant number, since it is smaller than the sum of its proper divisors (2760212633080).

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

1665645552200 is a wasteful number, since it uses less digits than its factorization.

1665645552200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189746846 (or 1189746837 counting only the distinct ones).

The product of its (nonzero) digits is 2160000, while the sum is 47.

The spelling of 1665645552200 in words is "one trillion, six hundred sixty-five billion, six hundred forty-five million, five hundred fifty-two thousand, two hundred".