163778660 has 24 divisors (see below), whose sum is σ = 355796280. Its totient is φ = 63252224.

The previous prime is 163778633. The next prime is 163778759. The reversal of 163778660 is 66877361.

It is a happy number.

163778660 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 7628644 + 156150016 = 2762^2 + 12496^2 .

163778660 is strictly pandigital in base 9.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140609 + ... + 141768.

It is an arithmetic number, because the mean of its divisors is an integer number (14824845).

Almost surely, 2^163778660 is an apocalyptic number.

163778660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163778660 is an abundant number, since it is smaller than the sum of its proper divisors (192017620).

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

163778660 is a wasteful number, since it uses less digits than its factorization.

163778660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282415 (or 282413 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 163778660 is about 12797.6036819398. The cubic root of 163778660 is about 547.1240067014.

The spelling of 163778660 in words is "one hundred sixty-three million, seven hundred seventy-eight thousand, six hundred sixty".