638620638923167 has 8 divisors (see below), whose sum is σ = 639142163550000. Its totient is φ = 638099130649344.

The previous prime is 638620638923161. The next prime is 638620638923257. The reversal of 638620638923167 is 761329836026836.

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 638620638923167 - 2⁷ = 638620638923039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 638620638923096 and 638620638923105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638620638923161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74667108 + ... + 82779334.

It is an arithmetic number, because the mean of its divisors is an integer number (79892770443750).

Almost surely, 2^{638620638923167} is an apocalyptic number.

638620638923167 is a deficient number, since it is larger than the sum of its proper divisors (521524626833).

638620638923167 is a wasteful number, since it uses less digits than its factorization.

638620638923167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8176505.

The product of its (nonzero) digits is 564350976, while the sum is 70.

The spelling of 638620638923167 in words is "six hundred thirty-eight trillion, six hundred twenty billion, six hundred thirty-eight million, nine hundred twenty-three thousand, one hundred sixty-seven".