6600861840 has 80 divisors (see below), whose sum is σ = 20565648000. Its totient is φ = 1751371776.

The previous prime is 6600861829. The next prime is 6600861857. The reversal of 6600861840 is 481680066.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21345 + ... + 116864.

It is an arithmetic number, because the mean of its divisors is an integer number (257070600).

Almost surely, 2^6600861840 is an apocalyptic number.

6600861840 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 6600861840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10282824000).

6600861840 is an abundant number, since it is smaller than the sum of its proper divisors (13964786160).

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

6600861840 is a wasteful number, since it uses less digits than its factorization.

6600861840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138424 (or 138418 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 6600861840 is about 81245.6881317403. The cubic root of 6600861840 is about 1875.8590992901.

The spelling of 6600861840 in words is "six billion, six hundred million, eight hundred sixty-one thousand, eight hundred forty".