205162113505 has 16 divisors (see below), whose sum is σ = 246609242064. Its totient is φ = 163853383680.

The previous prime is 205162113491. The next prime is 205162113547. The reversal of 205162113505 is 505311261502.

It can be written as a sum of positive squares in 8 ways, for example, as 6670478929 + 198491634576 = 81673^2 + 445524^2 .

It is not a de Polignac number, because 205162113505 - 2¹⁷ = 205161982433 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12531525 + ... + 12547885.

It is an arithmetic number, because the mean of its divisors is an integer number (15413077629).

Almost surely, 2^205162113505 is an apocalyptic number.

It is an amenable number.

205162113505 is a deficient number, since it is larger than the sum of its proper divisors (41447128559).

205162113505 is a wasteful number, since it uses less digits than its factorization.

205162113505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20436.

The product of its (nonzero) digits is 9000, while the sum is 31.

The spelling of 205162113505 in words is "two hundred five billion, one hundred sixty-two million, one hundred thirteen thousand, five hundred five".