205531453545 has 32 divisors (see below), whose sum is σ = 364100244480. Its totient is φ = 98164271040.

The previous prime is 205531453541. The next prime is 205531453549. The reversal of 205531453545 is 545354135502.

205531453545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (205531453541) and next prime (205531453549).

It is not a de Polignac number, because 205531453545 - 2² = 205531453541 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 205531453497 and 205531453506.

It is not an unprimeable number, because it can be changed into a prime (205531453541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9284805 + ... + 9306914.

It is an arithmetic number, because the mean of its divisors is an integer number (11378132640).

Almost surely, 2^205531453545 is an apocalyptic number.

It is an amenable number.

205531453545 is a deficient number, since it is larger than the sum of its proper divisors (158568790935).

205531453545 is a wasteful number, since it uses less digits than its factorization.

205531453545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18591805.

The product of its (nonzero) digits is 900000, while the sum is 42.

The spelling of 205531453545 in words is "two hundred five billion, five hundred thirty-one million, four hundred fifty-three thousand, five hundred forty-five".