1665333672 has 64 divisors (see below), whose sum is σ = 4251394560. Its totient is φ = 543456000.

The previous prime is 1665333661. The next prime is 1665333721. The reversal of 1665333672 is 2763335661.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 323922 + ... + 329022.

It is an arithmetic number, because the mean of its divisors is an integer number (66428040).

Almost surely, 2^1665333672 is an apocalyptic number.

1665333672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is a pronic number, being equal to 40808×40809.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665333672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2125697280).

1665333672 is an abundant number, since it is smaller than the sum of its proper divisors (2586060888).

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

1665333672 is a wasteful number, since it uses less digits than its factorization.

1665333672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5394 (or 5390 counting only the distinct ones).

The product of its digits is 408240, while the sum is 42.

The square root of 1665333672 is about 40808.4999969369. The cubic root of 1665333672 is about 1185.3149292035.

It can be divided in two parts, 16653 and 33672, that multiplied together give a triangular number (560739816 = T₃₃₄₈₈).

The spelling of 1665333672 in words is "one billion, six hundred sixty-five million, three hundred thirty-three thousand, six hundred seventy-two".