205541265140 has 12 divisors (see below), whose sum is σ = 431636656836. Its totient is φ = 82216506048.

The previous prime is 205541265133. The next prime is 205541265143. The reversal of 205541265140 is 41562145502.

It can be written as a sum of positive squares in 2 ways, for example, as 32708169316 + 172833095824 = 180854^2 + 415732^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 205541265140.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205541265143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5138531609 + ... + 5138531648.

It is an arithmetic number, because the mean of its divisors is an integer number (35969721403).

Almost surely, 2^205541265140 is an apocalyptic number.

205541265140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205541265140 is an abundant number, since it is smaller than the sum of its proper divisors (226095391696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205541265140 is a wasteful number, since it uses less digits than its factorization.

205541265140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10277063266 (or 10277063264 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 35.

The spelling of 205541265140 in words is "two hundred five billion, five hundred forty-one million, two hundred sixty-five thousand, one hundred forty".