205145134230555 has 80 divisors (see below), whose sum is σ = 371168260789920. Its totient is φ = 108843833161728.

The previous prime is 205145134230551. The next prime is 205145134230559. The reversal of 205145134230555 is 555032431541502.

205145134230555 is a `hidden beast` number, since 2 + 0 + 5 + 1 + 4 + 51 + 3 + 42 + 3 + 0 + 555 = 666.

It is an interprime number because it is at equal distance from previous prime (205145134230551) and next prime (205145134230559).

It is not a de Polignac number, because 205145134230555 - 2² = 205145134230551 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 205145134230555.

It is not an unprimeable number, because it can be changed into a prime (205145134230551) 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 79 ways as a sum of consecutive naturals, for example, 13593861 + ... + 24394329.

It is an arithmetic number, because the mean of its divisors is an integer number (4639603259874).

Almost surely, 2^{205145134230555} is an apocalyptic number.

205145134230555 is a deficient number, since it is larger than the sum of its proper divisors (166023126559365).

205145134230555 is an frugal number, since it uses more digits than its factorization.

205145134230555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10800694 (or 10800670 counting only the distinct ones).

The product of its (nonzero) digits is 1800000, while the sum is 45.

The spelling of 205145134230555 in words is "two hundred five trillion, one hundred forty-five billion, one hundred thirty-four million, two hundred thirty thousand, five hundred fifty-five".