1320564520056 has 128 divisors (see below), whose sum is σ = 3452412902400. Its totient is φ = 420516956160.

The previous prime is 1320564520019. The next prime is 1320564520069. The reversal of 1320564520056 is 6500254650231.

It is a junction number, because it is equal to n+sod(n) for n = 1320564519996 and 1320564520023.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78034476 + ... + 78051396.

It is an arithmetic number, because the mean of its divisors is an integer number (26971975800).

Almost surely, 2^{1320564520056} 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 1320564520056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1726206451200).

1320564520056 is an abundant number, since it is smaller than the sum of its proper divisors (2131848382344).

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

1320564520056 is a wasteful number, since it uses less digits than its factorization.

1320564520056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18629 (or 18625 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 39.

The spelling of 1320564520056 in words is "one trillion, three hundred twenty billion, five hundred sixty-four million, five hundred twenty thousand, fifty-six".