639168619663 has 8 divisors (see below), whose sum is σ = 730546860032. Its totient is φ = 547807488696.

The previous prime is 639168619619. The next prime is 639168619697. The reversal of 639168619663 is 366916861936.

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

It is a cyclic number.

It is not a de Polignac number, because 639168619663 - 2¹⁷ = 639168488591 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 639168619595 and 639168619604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639168619603) 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, 4197195 + ... + 4346812.

It is an arithmetic number, because the mean of its divisors is an integer number (91318357504).

Almost surely, 2^639168619663 is an apocalyptic number.

639168619663 is a deficient number, since it is larger than the sum of its proper divisors (91378240369).

639168619663 is a wasteful number, since it uses less digits than its factorization.

639168619663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8554701.

The product of its digits is 45349632, while the sum is 64.

The spelling of 639168619663 in words is "six hundred thirty-nine billion, one hundred sixty-eight million, six hundred nineteen thousand, six hundred sixty-three".