639168882249 has 8 divisors (see below), whose sum is σ = 863899494112. Its totient is φ = 420275429280.

The previous prime is 639168882241. The next prime is 639168882257. The reversal of 639168882249 is 942288861936.

It is an interprime number because it is at equal distance from previous prime (639168882241) and next prime (639168882257).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 639168882249 - 2³ = 639168882241 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 639168882249.

It is not an unprimeable number, because it can be changed into a prime (639168882241) 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 7 ways as a sum of consecutive naturals, for example, 1459289467 + ... + 1459289904.

It is an arithmetic number, because the mean of its divisors is an integer number (107987436764).

Almost surely, 2^639168882249 is an apocalyptic number.

It is an amenable number.

639168882249 is a deficient number, since it is larger than the sum of its proper divisors (224730611863).

639168882249 is a wasteful number, since it uses less digits than its factorization.

639168882249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2918579447.

The product of its digits is 71663616, while the sum is 66.

The spelling of 639168882249 in words is "six hundred thirty-nine billion, one hundred sixty-eight million, eight hundred eighty-two thousand, two hundred forty-nine".