168143956 has 6 divisors (see below), whose sum is σ = 294251930. Its totient is φ = 84071976.

The previous prime is 168143951. The next prime is 168143981. The reversal of 168143956 is 659341861.

It can be written as a sum of positive squares in only one way, i.e., 121440400 + 46703556 = 11020^2 + 6834^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168143951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21017991 + ... + 21017998.

Almost surely, 2^168143956 is an apocalyptic number.

It is an amenable number.

168143956 is a deficient number, since it is larger than the sum of its proper divisors (126107974).

168143956 is a wasteful number, since it uses less digits than its factorization.

168143956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42035993 (or 42035991 counting only the distinct ones).

The product of its digits is 155520, while the sum is 43.

The square root of 168143956 is about 12967.0334309741. The cubic root of 168143956 is about 551.9423949199.

The spelling of 168143956 in words is "one hundred sixty-eight million, one hundred forty-three thousand, nine hundred fifty-six".