6669428865840 has 2560 divisors, whose sum is σ = 27932932177920. Its totient is φ = 1448500838400.

The previous prime is 6669428865823. The next prime is 6669428865937. The reversal of 6669428865840 is 485688249666.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 511 ways as a sum of consecutive naturals, for example, 52515187857 + ... + 52515187983.

It is an arithmetic number, because the mean of its divisors is an integer number (10911301632).

Almost surely, 2^{6669428865840} is an apocalyptic number.

6669428865840 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 6669428865840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13966466088960).

6669428865840 is an abundant number, since it is smaller than the sum of its proper divisors (21263503312080).

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

6669428865840 is a wasteful number, since it uses less digits than its factorization.

6669428865840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320 (or 308 counting only the distinct ones).

The product of its (nonzero) digits is 955514880, while the sum is 72.

The spelling of 6669428865840 in words is "six trillion, six hundred sixty-nine billion, four hundred twenty-eight million, eight hundred sixty-five thousand, eight hundred forty".