6660195840 has 200 divisors, whose sum is σ = 23855459760. Its totient is φ = 1775996928.

The previous prime is 6660195823. The next prime is 6660195877. The reversal of 6660195840 is 485910666.

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

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 191301 + ... + 223419.

Almost surely, 2^6660195840 is an apocalyptic number.

6660195840 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 6660195840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11927729880).

6660195840 is an abundant number, since it is smaller than the sum of its proper divisors (17195263920).

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

6660195840 is an equidigital number, since it uses as much as digits as its factorization.

6660195840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32154 (or 32129 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 6660195840 is about 81610.0229138554. The cubic root of 6660195840 is about 1881.4629325393.

It can be divided in two parts, 6660 and 195840, that added together give a square (202500 = 450²).

The spelling of 6660195840 in words is "six billion, six hundred sixty million, one hundred ninety-five thousand, eight hundred forty".