168899893 has 2 divisors, whose sum is σ = 168899894. Its totient is φ = 168899892.

The previous prime is 168899813. The next prime is 168899903. The reversal of 168899893 is 398998861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136375684 + 32524209 = 11678^2 + 5703^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168899893 is a prime.

It is a super-2 number, since 2×168899893² = 57054347710822898, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168899813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84449946 + 84449947.

It is an arithmetic number, because the mean of its divisors is an integer number (84449947).

Almost surely, 2^168899893 is an apocalyptic number.

It is an amenable number.

168899893 is a deficient number, since it is larger than the sum of its proper divisors (1).

168899893 is an equidigital number, since it uses as much as digits as its factorization.

168899893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6718464, while the sum is 61.

The square root of 168899893 is about 12996.1491604244. The cubic root of 168899893 is about 552.7682943110.

The spelling of 168899893 in words is "one hundred sixty-eight million, eight hundred ninety-nine thousand, eight hundred ninety-three".