1205520551565 has 48 divisors (see below), whose sum is σ = 2128920053568. Its totient is φ = 582069312000.

The previous prime is 1205520551561. The next prime is 1205520551567. The reversal of 1205520551565 is 5651550255021.

It is not a de Polignac number, because 1205520551565 - 2² = 1205520551561 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205520551561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 940591 + ... + 1815420.

It is an arithmetic number, because the mean of its divisors is an integer number (44352501116).

Almost surely, 2^{1205520551565} is an apocalyptic number.

1205520551565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1205520551565 is a deficient number, since it is larger than the sum of its proper divisors (923399502003).

1205520551565 is a wasteful number, since it uses less digits than its factorization.

1205520551565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2756282 (or 2756271 counting only the distinct ones).

The product of its (nonzero) digits is 375000, while the sum is 42.

The spelling of 1205520551565 in words is "one trillion, two hundred five billion, five hundred twenty million, five hundred fifty-one thousand, five hundred sixty-five".