163438204568 has 32 divisors (see below), whose sum is σ = 310121913360. Its totient is φ = 80741836800.

The previous prime is 163438204541. The next prime is 163438204583. The reversal of 163438204568 is 865402834361.

It is a happy number.

It is a super-2 number, since 2×163438204568² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 291155 + ... + 641597.

Almost surely, 2^163438204568 is an apocalyptic number.

It is an amenable number.

163438204568 is a deficient number, since it is larger than the sum of its proper divisors (146683708792).

163438204568 is a wasteful number, since it uses less digits than its factorization.

163438204568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351147 (or 351143 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 50.

The spelling of 163438204568 in words is "one hundred sixty-three billion, four hundred thirty-eight million, two hundred four thousand, five hundred sixty-eight".