163974779 has 4 divisors (see below), whose sum is σ = 169264320. Its totient is φ = 158685240.

The previous prime is 163974773. The next prime is 163974803. The reversal of 163974779 is 977479361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 977479361 = 20143 ⋅48527.

It is a cyclic number.

It is not a de Polignac number, because 163974779 - 2¹⁶ = 163909243 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 163974779.

It is not an unprimeable number, because it can be changed into a prime (163974773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2644724 + ... + 2644785.

It is an arithmetic number, because the mean of its divisors is an integer number (42316080).

Almost surely, 2^163974779 is an apocalyptic number.

163974779 is a deficient number, since it is larger than the sum of its proper divisors (5289541).

163974779 is an equidigital number, since it uses as much as digits as its factorization.

163974779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5289540.

The product of its digits is 2000376, while the sum is 53.

The square root of 163974779 is about 12805.2637223917. The cubic root of 163974779 is about 547.3423066348.

The spelling of 163974779 in words is "one hundred sixty-three million, nine hundred seventy-four thousand, seven hundred seventy-nine".