6664227840 has 264 divisors, whose sum is σ = 23892420240. Its totient is φ = 1715503104.

The previous prime is 6664227839. The next prime is 6664227887. The reversal of 6664227840 is 487224666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1333827 + ... + 1338813.

Almost surely, 2^6664227840 is an apocalyptic number.

6664227840 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 6664227840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11946210120).

6664227840 is an abundant number, since it is smaller than the sum of its proper divisors (17228192400).

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

6664227840 is a wasteful number, since it uses less digits than its factorization.

6664227840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5047 (or 5026 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 45.

The square root of 6664227840 is about 81634.7220243935. The cubic root of 6664227840 is about 1881.8425273944.

The spelling of 6664227840 in words is "six billion, six hundred sixty-four million, two hundred twenty-seven thousand, eight hundred forty".