1305685403256 has 128 divisors (see below), whose sum is σ = 3630356029440. Its totient is φ = 388612684800.

The previous prime is 1305685403251. The next prime is 1305685403261. The reversal of 1305685403256 is 6523045865031.

It is an interprime number because it is at equal distance from previous prime (1305685403251) and next prime (1305685403261).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305685403251) 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, 22032241 + ... + 22091423.

It is an arithmetic number, because the mean of its divisors is an integer number (28362156480).

Almost surely, 2^{1305685403256} 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 1305685403256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1815178014720).

1305685403256 is an abundant number, since it is smaller than the sum of its proper divisors (2324670626184).

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

1305685403256 is a wasteful number, since it uses less digits than its factorization.

1305685403256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61517 (or 61513 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 48.

The spelling of 1305685403256 in words is "one trillion, three hundred five billion, six hundred eighty-five million, four hundred three thousand, two hundred fifty-six".