205505155545 has 32 divisors (see below), whose sum is σ = 337230998784. Its totient is φ = 106822560000.

The previous prime is 205505155501. The next prime is 205505155553. The reversal of 205505155545 is 545551505502.

It is not a de Polignac number, because 205505155545 - 2⁷ = 205505155417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 205505155497 and 205505155506.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 735906 + ... + 975995.

It is an arithmetic number, because the mean of its divisors is an integer number (10538468712).

Almost surely, 2^205505155545 is an apocalyptic number.

It is an amenable number.

205505155545 is a deficient number, since it is larger than the sum of its proper divisors (131725843239).

205505155545 is a wasteful number, since it uses less digits than its factorization.

205505155545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1712113.

The product of its (nonzero) digits is 625000, while the sum is 42.

The spelling of 205505155545 in words is "two hundred five billion, five hundred five million, one hundred fifty-five thousand, five hundred forty-five".