656211423220 has 24 divisors (see below), whose sum is σ = 1378528822944. Its totient is φ = 262392219936.

The previous prime is 656211423191. The next prime is 656211423223. The reversal of 656211423220 is 22324112656.

It is a super-2 number, since 2×656211423220² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656211423223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5713554 + ... + 5827273.

It is an arithmetic number, because the mean of its divisors is an integer number (57438700956).

Almost surely, 2^656211423220 is an apocalyptic number.

It is an amenable number.

656211423220 is an abundant number, since it is smaller than the sum of its proper divisors (722317399724).

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

656211423220 is a wasteful number, since it uses less digits than its factorization.

656211423220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11543679 (or 11543677 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

Adding to 656211423220 its reverse (22324112656), we get a palindrome (678535535876).

It can be divided in two parts, 65621 and 1423220, that added together give a palindrome (1488841).

The spelling of 656211423220 in words is "six hundred fifty-six billion, two hundred eleven million, four hundred twenty-three thousand, two hundred twenty".