6665919540 has 96 divisors (see below), whose sum is σ = 21550980864. Its totient is φ = 1507921920.

The previous prime is 6665919529. The next prime is 6665919569. The reversal of 6665919540 is 459195666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41071 + ... + 122550.

It is an arithmetic number, because the mean of its divisors is an integer number (224489384).

Almost surely, 2^6665919540 is an apocalyptic number.

6665919540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6665919540 is an abundant number, since it is smaller than the sum of its proper divisors (14885061324).

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

6665919540 is a wasteful number, since it uses less digits than its factorization.

6665919540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163737 (or 163735 counting only the distinct ones).

The product of its (nonzero) digits is 1749600, while the sum is 51.

The square root of 6665919540 is about 81645.0827668146. The cubic root of 6665919540 is about 1882.0017478243.

The spelling of 6665919540 in words is "six billion, six hundred sixty-five million, nine hundred nineteen thousand, five hundred forty".