163856438040 has 64 divisors (see below), whose sum is σ = 492126336000. Its totient is φ = 43645537152.

The previous prime is 163856437993. The next prime is 163856438041. The reversal of 163856438040 is 40834658361.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163856438041) 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, 667240 + ... + 879159.

It is an arithmetic number, because the mean of its divisors is an integer number (7689474000).

Almost surely, 2^163856438040 is an apocalyptic number.

163856438040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163856438040 is an abundant number, since it is smaller than the sum of its proper divisors (328269897960).

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

163856438040 is a wasteful number, since it uses less digits than its factorization.

163856438040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1547296 (or 1547292 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 48.

The spelling of 163856438040 in words is "one hundred sixty-three billion, eight hundred fifty-six million, four hundred thirty-eight thousand, forty".