2656223689140 has 144 divisors (see below), whose sum is σ = 9220409557632. Its totient is φ = 606334595328.

The previous prime is 2656223689103. The next prime is 2656223689157. The reversal of 2656223689140 is 419863226562.

2656223689140 is a `hidden beast` number, since 2 + 6 + 5 + 622 + 3 + 6 + 8 + 9 + 1 + 4 + 0 = 666.

It is a super-2 number, since 2×2656223689140² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 438594 + ... + 2346233.

It is an arithmetic number, because the mean of its divisors is an integer number (64030621928).

Almost surely, 2^{2656223689140} is an apocalyptic number.

2656223689140 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 2656223689140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4610204778816).

2656223689140 is an abundant number, since it is smaller than the sum of its proper divisors (6564185868492).

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

2656223689140 is a wasteful number, since it uses less digits than its factorization.

2656223689140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2785606 (or 2785601 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 54.

The spelling of 2656223689140 in words is "two trillion, six hundred fifty-six billion, two hundred twenty-three million, six hundred eighty-nine thousand, one hundred forty".