656211662140 has 24 divisors (see below), whose sum is σ = 1378572788880. Its totient is φ = 262384036608.

The previous prime is 656211662089. The next prime is 656211662207. The reversal of 656211662140 is 41266112656.

It is a super-2 number, since 2×656211662140² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 656211662093 and 656211662102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6235782 + ... + 6340141.

It is an arithmetic number, because the mean of its divisors is an integer number (57440532870).

Almost surely, 2^656211662140 is an apocalyptic number.

It is an amenable number.

656211662140 is an abundant number, since it is smaller than the sum of its proper divisors (722361126740).

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

656211662140 is a wasteful number, since it uses less digits than its factorization.

656211662140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12578541 (or 12578539 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

Adding to 656211662140 its reverse (41266112656), we get a palindrome (697477774796).

The spelling of 656211662140 in words is "six hundred fifty-six billion, two hundred eleven million, six hundred sixty-two thousand, one hundred forty".