1205520503540 has 24 divisors (see below), whose sum is σ = 2533572464640. Its totient is φ = 481831171488.

The previous prime is 1205520503519. The next prime is 1205520503569. The reversal of 1205520503540 is 453050255021.

It is a junction number, because it is equal to n+sod(n) for n = 1205520503497 and 1205520503506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23538152 + ... + 23589311.

It is an arithmetic number, because the mean of its divisors is an integer number (105565519360).

Almost surely, 2^{1205520503540} is an apocalyptic number.

1205520503540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1205520503540 is an abundant number, since it is smaller than the sum of its proper divisors (1328051961100).

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

1205520503540 is a wasteful number, since it uses less digits than its factorization.

1205520503540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47128751 (or 47128749 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 32.

Adding to 1205520503540 its reverse (453050255021), we get a palindrome (1658570758561).

The spelling of 1205520503540 in words is "one trillion, two hundred five billion, five hundred twenty million, five hundred three thousand, five hundred forty".