163447978875 has 32 divisors (see below), whose sum is σ = 272687800320. Its totient is φ = 86944575200.

The previous prime is 163447978873. The next prime is 163447978877. The reversal of 163447978875 is 578879744361.

163447978875 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (163447978873) and next prime (163447978877).

It is not a de Polignac number, because 163447978875 - 2¹ = 163447978873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (163447978873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 425385 + ... + 712634.

It is an arithmetic number, because the mean of its divisors is an integer number (8521493760).

Almost surely, 2^163447978875 is an apocalyptic number.

163447978875 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

163447978875 is a deficient number, since it is larger than the sum of its proper divisors (109239821445).

163447978875 is a wasteful number, since it uses less digits than its factorization.

163447978875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1138420 (or 1138410 counting only the distinct ones).

The product of its digits is 284497920, while the sum is 69.

The spelling of 163447978875 in words is "one hundred sixty-three billion, four hundred forty-seven million, nine hundred seventy-eight thousand, eight hundred seventy-five".