6665671320 has 256 divisors, whose sum is σ = 25355980800. Its totient is φ = 1361487360.

The previous prime is 6665671291. The next prime is 6665671343. The reversal of 6665671320 is 231765666.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 539047 + ... + 551273.

It is an arithmetic number, because the mean of its divisors is an integer number (99046800).

Almost surely, 2^6665671320 is an apocalyptic number.

6665671320 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 6665671320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12677990400).

6665671320 is an abundant number, since it is smaller than the sum of its proper divisors (18690309480).

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

6665671320 is a wasteful number, since it uses less digits than its factorization.

6665671320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12318 (or 12314 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 42.

The square root of 6665671320 is about 81643.5626366219. The cubic root of 6665671320 is about 1881.9783873927.

The spelling of 6665671320 in words is "six billion, six hundred sixty-five million, six hundred seventy-one thousand, three hundred twenty".