163020861891 has 12 divisors (see below), whose sum is σ = 235481052768. Its totient is φ = 108677586384.

The previous prime is 163020861863. The next prime is 163020861901. The reversal of 163020861891 is 198168020361.

163020861891 is a `hidden beast` number, since 1 + 6 + 3 + 0 + 20 + 8 + 618 + 9 + 1 = 666.

It is not a de Polignac number, because 163020861891 - 2⁹ = 163020861379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (163020863891) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 126261 + ... + 584793.

It is an arithmetic number, because the mean of its divisors is an integer number (19623421064).

Almost surely, 2^163020861891 is an apocalyptic number.

163020861891 is a deficient number, since it is larger than the sum of its proper divisors (72460190877).

163020861891 is a wasteful number, since it uses less digits than its factorization.

163020861891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498042 (or 498039 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 163020861891 in words is "one hundred sixty-three billion, twenty million, eight hundred sixty-one thousand, eight hundred ninety-one".