6664177720 has 64 divisors (see below), whose sum is σ = 15554851200. Its totient is φ = 2567685120.

The previous prime is 6664177717. The next prime is 6664177727. The reversal of 6664177720 is 277714666.

It is a super-2 number, since 2×6664177720² = 88822529367488796800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6664177727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103842 + ... + 155278.

It is an arithmetic number, because the mean of its divisors is an integer number (243044550).

Almost surely, 2^6664177720 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 6664177720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7777425600).

6664177720 is an abundant number, since it is smaller than the sum of its proper divisors (8890673480).

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

6664177720 is a wasteful number, since it uses less digits than its factorization.

6664177720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51568 (or 51564 counting only the distinct ones).

The product of its (nonzero) digits is 592704, while the sum is 46.

The square root of 6664177720 is about 81634.4150465966. The cubic root of 6664177720 is about 1881.8378097594.

The spelling of 6664177720 in words is "six billion, six hundred sixty-four million, one hundred seventy-seven thousand, seven hundred twenty".