6664865424 has 160 divisors (see below), whose sum is σ = 20030146560. Its totient is φ = 1870310400.

The previous prime is 6664865423. The next prime is 6664865483. The reversal of 6664865424 is 4245684666.

It is a super-2 number, since 2×6664865424² = 88840862240061399552, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6664865423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11713012 + ... + 11713580.

It is an arithmetic number, because the mean of its divisors is an integer number (125188416).

Almost surely, 2^6664865424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6664865424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10015073280).

6664865424 is an abundant number, since it is smaller than the sum of its proper divisors (13365281136).

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

6664865424 is a wasteful number, since it uses less digits than its factorization.

6664865424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1149 (or 1143 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 51.

The square root of 6664865424 is about 81638.6270340211. The cubic root of 6664865424 is about 1881.9025390693.

The spelling of 6664865424 in words is "six billion, six hundred sixty-four million, eight hundred sixty-five thousand, four hundred twenty-four".