168070681 has 2 divisors, whose sum is σ = 168070682. Its totient is φ = 168070680.

The previous prime is 168070621. The next prime is 168070699. The reversal of 168070681 is 186070861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153363456 + 14707225 = 12384^2 + 3835^2 .

It is a cyclic number.

It is not a de Polignac number, because 168070681 - 2²¹ = 165973529 is a prime.

It is a super-2 number, since 2×168070681² = 56495507623607522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 168070681.

It is not a weakly prime, because it can be changed into another prime (168070621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84035340 + 84035341.

It is an arithmetic number, because the mean of its divisors is an integer number (84035341).

Almost surely, 2^168070681 is an apocalyptic number.

It is an amenable number.

168070681 is a deficient number, since it is larger than the sum of its proper divisors (1).

168070681 is an equidigital number, since it uses as much as digits as its factorization.

168070681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 168070681 is about 12964.2076888640. The cubic root of 168070681 is about 551.8622067757.

It can be divided in two parts, 1680 and 70681, that added together give a square (72361 = 269²).

The spelling of 168070681 in words is "one hundred sixty-eight million, seventy thousand, six hundred eighty-one".