202161016517 has 4 divisors (see below), whose sum is σ = 214052841036. Its totient is φ = 190269192000.

The previous prime is 202161016507. The next prime is 202161016537. The reversal of 202161016517 is 715610161202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 125712084481 + 76448932036 = 354559^2 + 276494^2 .

It is a cyclic number.

It is not a de Polignac number, because 202161016517 - 2⁸ = 202161016261 is a prime.

It is a super-2 number, since 2×202161016517² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202161016507) 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, 5945912234 + ... + 5945912267.

It is an arithmetic number, because the mean of its divisors is an integer number (53513210259).

Almost surely, 2^202161016517 is an apocalyptic number.

It is an amenable number.

202161016517 is a deficient number, since it is larger than the sum of its proper divisors (11891824519).

202161016517 is a wasteful number, since it uses less digits than its factorization.

202161016517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11891824518.

The product of its (nonzero) digits is 5040, while the sum is 32.

Adding to 202161016517 its reverse (715610161202), we get a palindrome (917771177719).

The spelling of 202161016517 in words is "two hundred two billion, one hundred sixty-one million, sixteen thousand, five hundred seventeen".