205145113340521 has 16 divisors (see below), whose sum is σ = 212193442540800. Its totient is φ = 198215615334528.

The previous prime is 205145113340429. The next prime is 205145113340533. The reversal of 205145113340521 is 125043311541502.

It is a cyclic number.

It is not a de Polignac number, because 205145113340521 - 2³⁹ = 204595357526633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205145113340581) 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 15 ways as a sum of consecutive naturals, for example, 35446086 + ... + 40825423.

It is an arithmetic number, because the mean of its divisors is an integer number (13262090158800).

Almost surely, 2^{205145113340521} is an apocalyptic number.

It is an amenable number.

205145113340521 is a deficient number, since it is larger than the sum of its proper divisors (7048329200279).

205145113340521 is an equidigital number, since it uses as much as digits as its factorization.

205145113340521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76272288.

The product of its (nonzero) digits is 72000, while the sum is 37.

The spelling of 205145113340521 in words is "two hundred five trillion, one hundred forty-five billion, one hundred thirteen million, three hundred forty thousand, five hundred twenty-one".