163638824657 has 16 divisors (see below), whose sum is σ = 204490635264. Its totient is φ = 127214898000.

The previous prime is 163638824617. The next prime is 163638824729. The reversal of 163638824657 is 756428836361.

It is a cyclic number.

It is not a de Polignac number, because 163638824657 - 2¹⁸ = 163638562513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 163638824596 and 163638824605.

It is not an unprimeable number, because it can be changed into a prime (163638824617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2432219 + ... + 2498592.

It is an arithmetic number, because the mean of its divisors is an integer number (12780664704).

Almost surely, 2^163638824657 is an apocalyptic number.

It is an amenable number.

163638824657 is a deficient number, since it is larger than the sum of its proper divisors (40851810607).

163638824657 is a wasteful number, since it uses less digits than its factorization.

163638824657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4931260.

The product of its digits is 34836480, while the sum is 59.

The spelling of 163638824657 in words is "one hundred sixty-three billion, six hundred thirty-eight million, eight hundred twenty-four thousand, six hundred fifty-seven".