6606635640 has 128 divisors (see below), whose sum is σ = 22206251520. Its totient is φ = 1558310400.

The previous prime is 6606635639. The next prime is 6606635657. The reversal of 6606635640 is 465366066.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 6606635592 and 6606635601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18796 + ... + 116475.

It is an arithmetic number, because the mean of its divisors is an integer number (173486340).

Almost surely, 2^6606635640 is an apocalyptic number.

6606635640 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 6606635640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11103125760).

6606635640 is an abundant number, since it is smaller than the sum of its proper divisors (15599615880).

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

6606635640 is a wasteful number, since it uses less digits than its factorization.

6606635640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135333 (or 135329 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 42.

The square root of 6606635640 is about 81281.2133275580. The cubic root of 6606635640 is about 1876.4058803590.

It can be divided in two parts, 6606 and 635640, that added together give a palindrome (642246).

The spelling of 6606635640 in words is "six billion, six hundred six million, six hundred thirty-five thousand, six hundred forty".