6640610040 has 160 divisors (see below), whose sum is σ = 23632955280. Its totient is φ = 1666649088.

The previous prime is 6640610027. The next prime is 6640610051. The reversal of 6640610040 is 400160466.

6640610040 is a `hidden beast` number, since 6 + 6 + 4 + 0 + 610 + 0 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 6640609986 and 6640610013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5202 + ... + 115361.

Almost surely, 2^6640610040 is an apocalyptic number.

6640610040 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 6640610040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11816477640).

6640610040 is an abundant number, since it is smaller than the sum of its proper divisors (16992345240).

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

6640610040 is a wasteful number, since it uses less digits than its factorization.

6640610040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120603 (or 120590 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 6640610040 is about 81489.9382746115. The cubic root of 6640610040 is about 1879.6168337872.

The spelling of 6640610040 in words is "six billion, six hundred forty million, six hundred ten thousand, forty".