205513535145 has 32 divisors (see below), whose sum is σ = 331006279680. Its totient is φ = 108880621760.

The previous prime is 205513535137. The next prime is 205513535147. The reversal of 205513535145 is 541535315502.

It is not a de Polignac number, because 205513535145 - 2³ = 205513535137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205513535147) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2010052 + ... + 2109818.

It is an arithmetic number, because the mean of its divisors is an integer number (10343946240).

Almost surely, 2^205513535145 is an apocalyptic number.

It is an amenable number.

205513535145 is a deficient number, since it is larger than the sum of its proper divisors (125492744535).

205513535145 is a wasteful number, since it uses less digits than its factorization.

205513535145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100685.

The product of its (nonzero) digits is 225000, while the sum is 39.

The spelling of 205513535145 in words is "two hundred five billion, five hundred thirteen million, five hundred thirty-five thousand, one hundred forty-five".