6665379840000 has 2550 divisors, whose sum is σ = 29652899326974. Its totient is φ = 1486356480000.

The previous prime is 6665379839981. The next prime is 6665379840101. The reversal of 6665379840000 is 489735666.

It can be written as a sum of positive squares in 5 ways, for example, as 4463788621824 + 2201591218176 = 2112768^2 + 1483776^2 .

It is a super-2 number, since 2×6665379840000² (a number of 26 digits) contains 22 as substring.

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 149 ways as a sum of consecutive naturals, for example, 162570239980 + ... + 162570240020.

Almost surely, 2^{6665379840000} is an apocalyptic number.

6665379840000 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 6665379840000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14826449663487).

6665379840000 is an abundant number, since it is smaller than the sum of its proper divisors (22987519486974).

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

6665379840000 is an frugal number, since it uses more digits than its factorization.

6665379840000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119 (or 58 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 54.

The spelling of 6665379840000 in words is "six trillion, six hundred sixty-five billion, three hundred seventy-nine million, eight hundred forty thousand".