163015661 has 2 divisors, whose sum is σ = 163015662. Its totient is φ = 163015660.

The previous prime is 163015637. The next prime is 163015663. The reversal of 163015661 is 166510361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85470025 + 77545636 = 9245^2 + 8806^2 .

It is an emirp because it is prime and its reverse (166510361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163015661 - 2⁶ = 163015597 is a prime.

It is a Sophie Germain prime.

Together with 163015663, it forms a pair of twin primes.

It is a Chen 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 (163015663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81507830 + 81507831.

It is an arithmetic number, because the mean of its divisors is an integer number (81507831).

Almost surely, 2^163015661 is an apocalyptic number.

It is an amenable number.

163015661 is a deficient number, since it is larger than the sum of its proper divisors (1).

163015661 is an equidigital number, since it uses as much as digits as its factorization.

163015661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 163015661 is about 12767.7586521676. The cubic root of 163015661 is about 546.2730512678.

It can be divided in two parts, 16 and 3015661, that multiplied together give a triangular number (48250576 = T₉₈₂₃).

The spelling of 163015661 in words is "one hundred sixty-three million, fifteen thousand, six hundred sixty-one".