1365781521356 has 24 divisors (see below), whose sum is σ = 2738374943136. Its totient is φ = 583875244800.

The previous prime is 1365781521353. The next prime is 1365781521389. The reversal of 1365781521356 is 6531251875631.

It is a junction number, because it is equal to n+sod(n) for n = 1365781521298 and 1365781521307.

It is not an unprimeable number, because it can be changed into a prime (1365781521353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60809111 + ... + 60831566.

It is an arithmetic number, because the mean of its divisors is an integer number (114098955964).

Almost surely, 2^{1365781521356} is an apocalyptic number.

It is an amenable number.

1365781521356 is an abundant number, since it is smaller than the sum of its proper divisors (1372593421780).

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

1365781521356 is a wasteful number, since it uses less digits than its factorization.

1365781521356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121641089 (or 121641087 counting only the distinct ones).

The product of its digits is 4536000, while the sum is 53.

The spelling of 1365781521356 in words is "one trillion, three hundred sixty-five billion, seven hundred eighty-one million, five hundred twenty-one thousand, three hundred fifty-six".