398566179871 has 4 divisors (see below), whose sum is σ = 401433562600. Its totient is φ = 395698797144.

The previous prime is 398566179829. The next prime is 398566179911. The reversal of 398566179871 is 178971665893.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 178971665893 = 13259 ⋅13498127.

It is a cyclic number.

It is not a de Polignac number, because 398566179871 - 2²⁹ = 398029308959 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 398566179871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398566179811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1433691156 + ... + 1433691433.

It is an arithmetic number, because the mean of its divisors is an integer number (100358390650).

Almost surely, 2^398566179871 is an apocalyptic number.

398566179871 is a deficient number, since it is larger than the sum of its proper divisors (2867382729).

398566179871 is a wasteful number, since it uses less digits than its factorization.

398566179871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2867382728.

The product of its digits is 137168640, while the sum is 70.

The spelling of 398566179871 in words is "three hundred ninety-eight billion, five hundred sixty-six million, one hundred seventy-nine thousand, eight hundred seventy-one".