6665833440 has 240 divisors, whose sum is σ = 26885894112. Its totient is φ = 1523598336.

The previous prime is 6665833411. The next prime is 6665833453. The reversal of 6665833440 is 443385666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 53982 + ... + 127458.

Almost surely, 2^6665833440 is an apocalyptic number.

6665833440 is a gapful number since it is divisible by the number (60) 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 6665833440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13442947056).

6665833440 is an abundant number, since it is smaller than the sum of its proper divisors (20220060672).

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

6665833440 is a wasteful number, since it uses less digits than its factorization.

6665833440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73511 (or 73494 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 45.

The square root of 6665833440 is about 81644.5554828979. Note that the first 3 decimals coincide. The cubic root of 6665833440 is about 1881.9936448638.

The spelling of 6665833440 in words is "six billion, six hundred sixty-five million, eight hundred thirty-three thousand, four hundred forty".