1665011250 has 120 divisors (see below), whose sum is σ = 5152200768. Its totient is φ = 380556000.

The previous prime is 1665011233. The next prime is 1665011311. The reversal of 1665011250 is 521105661.

It is a happy number.

1665011250 is a `hidden beast` number, since 1 + 6 + 650 + 1 + 1 + 2 + 5 + 0 = 666.

It is a super-3 number, since 3×1665011250³ (a number of 29 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 68179 + ... + 89321.

Almost surely, 2^1665011250 is an apocalyptic number.

1665011250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665011250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2576100384).

1665011250 is an abundant number, since it is smaller than the sum of its proper divisors (3487189518).

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

1665011250 is a wasteful number, since it uses less digits than its factorization.

1665011250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21178 (or 21160 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 1665011250 is about 40804.5493787151. The cubic root of 1665011250 is about 1185.2384287634.

The spelling of 1665011250 in words is "one billion, six hundred sixty-five million, eleven thousand, two hundred fifty".