163878449449 has 32 divisors (see below), whose sum is σ = 193429006848. Its totient is φ = 136878336000.

The previous prime is 163878449437. The next prime is 163878449453. The reversal of 163878449449 is 944944878361.

163878449449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163878449449 is a prime.

It is a super-2 number, since 2×163878449449² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (163878449479) 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, 49463617 + ... + 49466929.

It is an arithmetic number, because the mean of its divisors is an integer number (6044656464).

Almost surely, 2^163878449449 is an apocalyptic number.

It is an amenable number.

163878449449 is a deficient number, since it is larger than the sum of its proper divisors (29550557399).

163878449449 is a wasteful number, since it uses less digits than its factorization.

163878449449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4849.

The product of its digits is 167215104, while the sum is 67.

The spelling of 163878449449 in words is "one hundred sixty-three billion, eight hundred seventy-eight million, four hundred forty-nine thousand, four hundred forty-nine".