161188663 has 2 divisors, whose sum is σ = 161188664. Its totient is φ = 161188662.

The previous prime is 161188661. The next prime is 161188681. The reversal of 161188663 is 366881161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161188663 - 2¹ = 161188661 is a prime.

Together with 161188661, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161188661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80594331 + 80594332.

It is an arithmetic number, because the mean of its divisors is an integer number (80594332).

Almost surely, 2^161188663 is an apocalyptic number.

161188663 is a deficient number, since it is larger than the sum of its proper divisors (1).

161188663 is an equidigital number, since it uses as much as digits as its factorization.

161188663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 40.

The square root of 161188663 is about 12696.0097274695. The cubic root of 161188663 is about 544.2245943563.

The spelling of 161188663 in words is "one hundred sixty-one million, one hundred eighty-eight thousand, six hundred sixty-three".