163778963 has 2 divisors, whose sum is σ = 163778964. Its totient is φ = 163778962.

The previous prime is 163778941. The next prime is 163778981. The reversal of 163778963 is 369877361.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 163778963 - 2⁶ = 163778899 is a prime.

It is not a weakly prime, because it can be changed into another prime (163718963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81889481 + 81889482.

It is an arithmetic number, because the mean of its divisors is an integer number (81889482).

Almost surely, 2^163778963 is an apocalyptic number.

163778963 is a deficient number, since it is larger than the sum of its proper divisors (1).

163778963 is an equidigital number, since it uses as much as digits as its factorization.

163778963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 50.

The square root of 163778963 is about 12797.6155200881. The cubic root of 163778963 is about 547.1243441049.

The spelling of 163778963 in words is "one hundred sixty-three million, seven hundred seventy-eight thousand, nine hundred sixty-three".