205161516 has 72 divisors (see below), whose sum is σ = 603910944. Its totient is φ = 57507840.

The previous prime is 205161497. The next prime is 205161521. The reversal of 205161516 is 615161502.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 205161516.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5676 + ... + 21036.

It is an arithmetic number, because the mean of its divisors is an integer number (8387652).

Almost surely, 2^205161516 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 205161516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (301955472).

205161516 is an abundant number, since it is smaller than the sum of its proper divisors (398749428).

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

205161516 is a wasteful number, since it uses less digits than its factorization.

205161516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15431 (or 15426 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 205161516 is about 14323.4603361059. The cubic root of 205161516 is about 589.7916682824.

The spelling of 205161516 in words is "two hundred five million, one hundred sixty-one thousand, five hundred sixteen".