656213342120 has 128 divisors (see below), whose sum is σ = 1745993491200. Its totient is φ = 217179303936.

The previous prime is 656213342107. The next prime is 656213342123. The reversal of 656213342120 is 21243312656.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (656213342123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56403824 + ... + 56415456.

It is an arithmetic number, because the mean of its divisors is an integer number (13640574150).

Almost surely, 2^656213342120 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 656213342120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (872996745600).

656213342120 is an abundant number, since it is smaller than the sum of its proper divisors (1089780149080).

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

656213342120 is a wasteful number, since it uses less digits than its factorization.

656213342120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18627 (or 18623 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

Adding to 656213342120 its reverse (21243312656), we get a palindrome (677456654776).

The spelling of 656213342120 in words is "six hundred fifty-six billion, two hundred thirteen million, three hundred forty-two thousand, one hundred twenty".