6665978592 has 480 divisors, whose sum is σ = 24588748800. Its totient is φ = 1724654592.

The previous prime is 6665978587. The next prime is 6665978621. The reversal of 6665978592 is 2958795666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 13916209 + ... + 13916687.

It is an arithmetic number, because the mean of its divisors is an integer number (51226560).

Almost surely, 2^6665978592 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6665978592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12294374400).

6665978592 is an abundant number, since it is smaller than the sum of its proper divisors (17922770208).

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

6665978592 is a wasteful number, since it uses less digits than its factorization.

6665978592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580 (or 563 counting only the distinct ones).

The product of its digits is 48988800, while the sum is 63.

The square root of 6665978592 is about 81645.4444044492. Note that the first 4 decimals coincide. The cubic root of 6665978592 is about 1882.0073052291.

The spelling of 6665978592 in words is "six billion, six hundred sixty-five million, nine hundred seventy-eight thousand, five hundred ninety-two".