163994211381 has 288 divisors, whose sum is σ = 312635817984. Its totient is φ = 74724249600.

The previous prime is 163994211307. The next prime is 163994211449. The reversal of 163994211381 is 183112499361.

It is not a de Polignac number, because 163994211381 - 2⁹ = 163994210869 is a prime.

It is a super-2 number, since 2×163994211381² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 163994211381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163994211181) 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 287 ways as a sum of consecutive naturals, for example, 1291292940 + ... + 1291293066.

Almost surely, 2^163994211381 is an apocalyptic number.

163994211381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

163994211381 is a deficient number, since it is larger than the sum of its proper divisors (148641606603).

163994211381 is a wasteful number, since it uses less digits than its factorization.

163994211381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313 (or 289 counting only the distinct ones).

The product of its digits is 279936, while the sum is 48.

The spelling of 163994211381 in words is "one hundred sixty-three billion, nine hundred ninety-four million, two hundred eleven thousand, three hundred eighty-one".