638863622542 has 16 divisors (see below), whose sum is σ = 988735688640. Its totient is φ = 309437642592.

The previous prime is 638863622539. The next prime is 638863622549. The reversal of 638863622542 is 245226368836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638863622549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38137293 + ... + 38154040.

It is an arithmetic number, because the mean of its divisors is an integer number (61795980540).

Almost surely, 2^638863622542 is an apocalyptic number.

638863622542 is a deficient number, since it is larger than the sum of its proper divisors (349872066098).

638863622542 is a wasteful number, since it uses less digits than its factorization.

638863622542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76291467.

The product of its digits is 19906560, while the sum is 55.

The spelling of 638863622542 in words is "six hundred thirty-eight billion, eight hundred sixty-three million, six hundred twenty-two thousand, five hundred forty-two".