1205145342855 has 24 divisors (see below), whose sum is σ = 2089238170032. Its totient is φ = 642645851904.

The previous prime is 1205145342853. The next prime is 1205145342889. The reversal of 1205145342855 is 5582435415021.

1205145342855 is a `hidden beast` number, since 1 + 2 + 0 + 514 + 53 + 4 + 2 + 85 + 5 = 666.

It is not a de Polignac number, because 1205145342855 - 2¹ = 1205145342853 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1205145342855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205145342853) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1750674 + ... + 2339903.

It is an arithmetic number, because the mean of its divisors is an integer number (87051590418).

Almost surely, 2^{1205145342855} is an apocalyptic number.

1205145342855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1205145342855 is a deficient number, since it is larger than the sum of its proper divisors (884092827177).

1205145342855 is a wasteful number, since it uses less digits than its factorization.

1205145342855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4097135 (or 4097132 counting only the distinct ones).

The product of its (nonzero) digits is 960000, while the sum is 45.

The spelling of 1205145342855 in words is "one trillion, two hundred five billion, one hundred forty-five million, three hundred forty-two thousand, eight hundred fifty-five".