6665972544 has 672 divisors, whose sum is σ = 26393973120. Its totient is φ = 1625702400.

The previous prime is 6665972519. The next prime is 6665972569. The reversal of 6665972544 is 4452795666.

It is an interprime number because it is at equal distance from previous prime (6665972519) and next prime (6665972569).

It is a tau number, because it is divible by the number of its divisors (672).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15833454 + ... + 15833874.

Almost surely, 2^6665972544 is an apocalyptic number.

6665972544 is a gapful number since it is divisible by the number (64) 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 6665972544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13196986560).

6665972544 is an abundant number, since it is smaller than the sum of its proper divisors (19728000576).

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

6665972544 is a wasteful number, since it uses less digits than its factorization.

6665972544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484 (or 461 counting only the distinct ones).

The product of its digits is 10886400, while the sum is 54.

The square root of 6665972544 is about 81645.4073662444. The cubic root of 6665972544 is about 1882.0067360512.

The spelling of 6665972544 in words is "six billion, six hundred sixty-five million, nine hundred seventy-two thousand, five hundred forty-four".