163781956 has 24 divisors (see below), whose sum is σ = 310509080. Its totient is φ = 75587616.

The previous prime is 163781941. The next prime is 163781987. The reversal of 163781956 is 659187361.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 108784900 + 54997056 = 10430^2 + 7416^2 .

It is a super-3 number, since 3×163781956³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

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, 531 + ... + 18106.

Almost surely, 2^163781956 is an apocalyptic number.

It is an amenable number.

163781956 is a deficient number, since it is larger than the sum of its proper divisors (146727124).

163781956 is a wasteful number, since it uses less digits than its factorization.

163781956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18680 (or 18652 counting only the distinct ones).

The product of its digits is 272160, while the sum is 46.

The square root of 163781956 is about 12797.7324554001. The cubic root of 163781956 is about 547.1276769163.

The spelling of 163781956 in words is "one hundred sixty-three million, seven hundred eighty-one thousand, nine hundred fifty-six".