163678553 has 2 divisors, whose sum is σ = 163678554. Its totient is φ = 163678552.

The previous prime is 163678531. The next prime is 163678591. The reversal of 163678553 is 355876361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154455184 + 9223369 = 12428^2 + 3037^2 .

It is a cyclic number.

It is not a de Polignac number, because 163678553 - 2¹⁶ = 163613017 is a prime.

It is not a weakly prime, because it can be changed into another prime (163678513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81839276 + 81839277.

It is an arithmetic number, because the mean of its divisors is an integer number (81839277).

Almost surely, 2^163678553 is an apocalyptic number.

It is an amenable number.

163678553 is a deficient number, since it is larger than the sum of its proper divisors (1).

163678553 is an equidigital number, since it uses as much as digits as its factorization.

163678553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 453600, while the sum is 44.

The square root of 163678553 is about 12793.6919221935. The cubic root of 163678553 is about 547.0125104784.

The spelling of 163678553 in words is "one hundred sixty-three million, six hundred seventy-eight thousand, five hundred fifty-three".