168640847 has 2 divisors, whose sum is σ = 168640848. Its totient is φ = 168640846.

The previous prime is 168640793. The next prime is 168640873. The reversal of 168640847 is 748046861.

It is a strong prime.

It is an emirp because it is prime and its reverse (748046861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 168640847 - 2¹² = 168636751 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 168640798 and 168640807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168640897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84320423 + 84320424.

It is an arithmetic number, because the mean of its divisors is an integer number (84320424).

Almost surely, 2^168640847 is an apocalyptic number.

168640847 is a deficient number, since it is larger than the sum of its proper divisors (1).

168640847 is an equidigital number, since it uses as much as digits as its factorization.

168640847 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 258048, while the sum is 44.

The square root of 168640847 is about 12986.1790762333. The cubic root of 168640847 is about 552.4855515150.

The spelling of 168640847 in words is "one hundred sixty-eight million, six hundred forty thousand, eight hundred forty-seven".