168998879 has 4 divisors (see below), whose sum is σ = 193141584. Its totient is φ = 144856176.

The previous prime is 168998867. The next prime is 168998909. The reversal of 168998879 is 978899861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 978899861 = 37 ⋅26456753.

It is a cyclic number.

It is not a de Polignac number, because 168998879 - 2⁸ = 168998623 is a prime.

It is a super-2 number, since 2×168998879² = 57121242206513282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168998839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12071342 + ... + 12071355.

It is an arithmetic number, because the mean of its divisors is an integer number (48285396).

Almost surely, 2^168998879 is an apocalyptic number.

168998879 is a deficient number, since it is larger than the sum of its proper divisors (24142705).

168998879 is an equidigital number, since it uses as much as digits as its factorization.

168998879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24142704.

The product of its digits is 15676416, while the sum is 65.

The square root of 168998879 is about 12999.9568845439. The cubic root of 168998879 is about 552.8762589280.

The spelling of 168998879 in words is "one hundred sixty-eight million, nine hundred ninety-eight thousand, eight hundred seventy-nine".