163861131378 has 64 divisors (see below), whose sum is σ = 382364985600. Its totient is φ = 46795222656.

The previous prime is 163861131359. The next prime is 163861131487. The reversal of 163861131378 is 873131168361.

It is a happy 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 31 ways as a sum of consecutive naturals, for example, 4585950 + ... + 4621542.

It is an arithmetic number, because the mean of its divisors is an integer number (5974452900).

Almost surely, 2^163861131378 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 163861131378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191182492800).

163861131378 is an abundant number, since it is smaller than the sum of its proper divisors (218503854222).

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

163861131378 is a wasteful number, since it uses less digits than its factorization.

163861131378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37856 (or 37842 counting only the distinct ones).

The product of its digits is 435456, while the sum is 48.

The spelling of 163861131378 in words is "one hundred sixty-three billion, eight hundred sixty-one million, one hundred thirty-one thousand, three hundred seventy-eight".