656018636 has 48 divisors (see below), whose sum is σ = 1416167424. Its totient is φ = 258935616.

The previous prime is 656018633. The next prime is 656018647. The reversal of 656018636 is 636810656.

It is a junction number, because it is equal to n+sod(n) for n = 656018593 and 656018602.

It is not an unprimeable number, because it can be changed into a prime (656018633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 181301 + ... + 184883.

It is an arithmetic number, because the mean of its divisors is an integer number (29503488).

Almost surely, 2^656018636 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 656018636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (708083712).

656018636 is an abundant number, since it is smaller than the sum of its proper divisors (760148788).

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

656018636 is a wasteful number, since it uses less digits than its factorization.

656018636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4110 (or 4108 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 656018636 is about 25612.8607539259. The cubic root of 656018636 is about 868.9045250999.

The spelling of 656018636 in words is "six hundred fifty-six million, eighteen thousand, six hundred thirty-six".