1213843420656 has 240 divisors, whose sum is σ = 3789707443200. Its totient is φ = 370951436160.

The previous prime is 1213843420651. The next prime is 1213843420661. The reversal of 1213843420656 is 6560243483121.

1213843420656 is a `hidden beast` number, since 1 + 2 + 1 + 3 + 8 + 434 + 206 + 5 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (1213843420651) and next prime (1213843420661).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213843420651) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7810945 + ... + 7964831.

It is an arithmetic number, because the mean of its divisors is an integer number (15790447680).

Almost surely, 2^{1213843420656} is an apocalyptic number.

1213843420656 is a gapful number since it is divisible by the number (16) 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 1213843420656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1894853721600).

1213843420656 is an abundant number, since it is smaller than the sum of its proper divisors (2575864022544).

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

1213843420656 is a wasteful number, since it uses less digits than its factorization.

1213843420656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153985 (or 153942 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 45.

The spelling of 1213843420656 in words is "one trillion, two hundred thirteen billion, eight hundred forty-three million, four hundred twenty thousand, six hundred fifty-six".