202165253981 has 2 divisors, whose sum is σ = 202165253982. Its totient is φ = 202165253980.

The previous prime is 202165253963. The next prime is 202165254007. The reversal of 202165253981 is 189352561202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199371180100 + 2794073881 = 446510^2 + 52859^2 .

It is a cyclic number.

It is not a de Polignac number, because 202165253981 - 2³⁰ = 201091512157 is a prime.

It is a super-2 number, since 2×202165253981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202165253921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101082626990 + 101082626991.

It is an arithmetic number, because the mean of its divisors is an integer number (101082626991).

Almost surely, 2^202165253981 is an apocalyptic number.

It is an amenable number.

202165253981 is a deficient number, since it is larger than the sum of its proper divisors (1).

202165253981 is an equidigital number, since it uses as much as digits as its factorization.

202165253981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 259200, while the sum is 44.

The spelling of 202165253981 in words is "two hundred two billion, one hundred sixty-five million, two hundred fifty-three thousand, nine hundred eighty-one".