163994915394 has 12 divisors (see below), whose sum is σ = 355322316726. Its totient is φ = 54664971792.

The previous prime is 163994915351. The next prime is 163994915431. The reversal of 163994915394 is 493519499361.

163994915394 is a `hidden beast` number, since 1 + 6 + 3 + 9 + 9 + 4 + 91 + 539 + 4 = 666.

163994915394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 148446072369 + 15548843025 = 385287^2 + 124695^2 .

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 4555414299 + ... + 4555414334.

Almost surely, 2^163994915394 is an apocalyptic number.

163994915394 is an abundant number, since it is smaller than the sum of its proper divisors (191327401332).

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

163994915394 is a wasteful number, since it uses less digits than its factorization.

163994915394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9110828641 (or 9110828638 counting only the distinct ones).

The product of its digits is 28343520, while the sum is 63.

The spelling of 163994915394 in words is "one hundred sixty-three billion, nine hundred ninety-four million, nine hundred fifteen thousand, three hundred ninety-four".