161513663 has 2 divisors, whose sum is σ = 161513664. Its totient is φ = 161513662.

The previous prime is 161513641. The next prime is 161513701. The reversal of 161513663 is 366315161.

It is a weak prime.

It is an emirp because it is prime and its reverse (366315161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161513663 - 2¹⁰ = 161512639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161513563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80756831 + 80756832.

It is an arithmetic number, because the mean of its divisors is an integer number (80756832).

Almost surely, 2^161513663 is an apocalyptic number.

161513663 is a deficient number, since it is larger than the sum of its proper divisors (1).

161513663 is an equidigital number, since it uses as much as digits as its factorization.

161513663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 32.

The square root of 161513663 is about 12708.8025793149. The cubic root of 161513663 is about 544.5901168611.

The spelling of 161513663 in words is "one hundred sixty-one million, five hundred thirteen thousand, six hundred sixty-three".