168143557 has 2 divisors, whose sum is σ = 168143558. Its totient is φ = 168143556.

The previous prime is 168143533. The next prime is 168143567. The reversal of 168143557 is 755341861.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158986881 + 9156676 = 12609^2 + 3026^2 .

It is an emirp because it is prime and its reverse (755341861) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168143557 is a prime.

It is a super-2 number, since 2×168143557² = 56544511521224498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168143567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84071778 + 84071779.

It is an arithmetic number, because the mean of its divisors is an integer number (84071779).

Almost surely, 2^168143557 is an apocalyptic number.

It is an amenable number.

168143557 is a deficient number, since it is larger than the sum of its proper divisors (1).

168143557 is an equidigital number, since it uses as much as digits as its factorization.

168143557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 40.

The square root of 168143557 is about 12967.0180457960. The cubic root of 168143557 is about 551.9419583392.

The spelling of 168143557 in words is "one hundred sixty-eight million, one hundred forty-three thousand, five hundred fifty-seven".