163102513656581 has 2 divisors, whose sum is σ = 163102513656582. Its totient is φ = 163102513656580.

The previous prime is 163102513656569. The next prime is 163102513656659. The reversal of 163102513656581 is 185656315201361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162788661605956 + 313852050625 = 12758866^2 + 560225^2 .

It is a cyclic number.

It is not a de Polignac number, because 163102513656581 - 2¹⁸ = 163102513394437 is a prime.

It is a super-2 number, since 2×163102513656581² (a number of 29 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163102513656881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81551256828290 + 81551256828291.

It is an arithmetic number, because the mean of its divisors is an integer number (81551256828291).

Almost surely, 2^{163102513656581} is an apocalyptic number.

It is an amenable number.

163102513656581 is a deficient number, since it is larger than the sum of its proper divisors (1).

163102513656581 is an equidigital number, since it uses as much as digits as its factorization.

163102513656581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888000, while the sum is 53.

The spelling of 163102513656581 in words is "one hundred sixty-three trillion, one hundred two billion, five hundred thirteen million, six hundred fifty-six thousand, five hundred eighty-one".