1356781123320 has 384 divisors, whose sum is σ = 4854986035200. Its totient is φ = 302269900800.

The previous prime is 1356781123307. The next prime is 1356781123339. The reversal of 1356781123320 is 233211876531.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 346912165 + ... + 346916075.

It is an arithmetic number, because the mean of its divisors is an integer number (12643192800).

Almost surely, 2^{1356781123320} is an apocalyptic number.

1356781123320 is a gapful number since it is divisible by the number (10) 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 1356781123320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2427493017600).

1356781123320 is an abundant number, since it is smaller than the sum of its proper divisors (3498204911880).

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

1356781123320 is a wasteful number, since it uses less digits than its factorization.

1356781123320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5419 (or 5408 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

Adding to 1356781123320 its reverse (233211876531), we get a palindrome (1589992999851).

The spelling of 1356781123320 in words is "one trillion, three hundred fifty-six billion, seven hundred eighty-one million, one hundred twenty-three thousand, three hundred twenty".