6656113840 has 80 divisors (see below), whose sum is σ = 15889045536. Its totient is φ = 2591590400.

The previous prime is 6656113837. The next prime is 6656113847. The reversal of 6656113840 is 483116566.

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

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 6656113793 and 6656113802.

It is not an unprimeable number, because it can be changed into a prime (6656113847) 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, 1608414 + ... + 1612546.

Almost surely, 2^6656113840 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 6656113840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7944522768).

6656113840 is an abundant number, since it is smaller than the sum of its proper divisors (9232931696).

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

6656113840 is a wasteful number, since it uses less digits than its factorization.

6656113840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4678 (or 4672 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 6656113840 is about 81585.0098976522. The cubic root of 6656113840 is about 1881.0784743118.

The spelling of 6656113840 in words is "six billion, six hundred fifty-six million, one hundred thirteen thousand, eight hundred forty".