163931841940 has 24 divisors (see below), whose sum is σ = 344337313320. Its totient is φ = 65557413888.

The previous prime is 163931841919. The next prime is 163931841967. The reversal of 163931841940 is 49148139361.

It can be written as a sum of positive squares in 4 ways, for example, as 6787782544 + 157144059396 = 82388^2 + 396414^2 .

It is a super-2 number, since 2×163931841940² (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, 869757 + ... + 1041316.

It is an arithmetic number, because the mean of its divisors is an integer number (14347388055).

Almost surely, 2^163931841940 is an apocalyptic number.

163931841940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163931841940 is an abundant number, since it is smaller than the sum of its proper divisors (180405471380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

163931841940 is a wasteful number, since it uses less digits than its factorization.

163931841940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1915371 (or 1915369 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 49.

The spelling of 163931841940 in words is "one hundred sixty-three billion, nine hundred thirty-one million, eight hundred forty-one thousand, nine hundred forty".