2018656640 has 512 divisors, whose sum is σ = 6810531840. Its totient is φ = 551485440.

The previous prime is 2018656583. The next prime is 2018656649. The reversal of 2018656640 is 466568102.

It is a junction number, because it is equal to n+sod(n) for n = 2018656594 and 2018656603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2018656649) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14734652 + ... + 14734788.

It is an arithmetic number, because the mean of its divisors is an integer number (13301820).

Almost surely, 2^2018656640 is an apocalyptic number.

2018656640 is a gapful number since it is divisible by the number (20) 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 2018656640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3405265920).

2018656640 is an abundant number, since it is smaller than the sum of its proper divisors (4791875200).

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

2018656640 is a wasteful number, since it uses less digits than its factorization.

2018656640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210 (or 198 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 2018656640 is about 44929.4629391450. The cubic root of 2018656640 is about 1263.8265798505.

The spelling of 2018656640 in words is "two billion, eighteen million, six hundred fifty-six thousand, six hundred forty".