638407044122 has 16 divisors (see below), whose sum is σ = 969222596832. Its totient is φ = 315333437040.

The previous prime is 638407044097. The next prime is 638407044137. The reversal of 638407044122 is 221440704836.

It is a self number, because there is not a number n which added to its sum of digits gives 638407044122.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2120972 + ... + 2403192.

It is an arithmetic number, because the mean of its divisors is an integer number (60576412302).

Almost surely, 2^638407044122 is an apocalyptic number.

638407044122 is a deficient number, since it is larger than the sum of its proper divisors (330815552710).

638407044122 is a wasteful number, since it uses less digits than its factorization.

638407044122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295933.

The product of its (nonzero) digits is 258048, while the sum is 41.

Adding to 638407044122 its reverse (221440704836), we get a palindrome (859847748958).

The spelling of 638407044122 in words is "six hundred thirty-eight billion, four hundred seven million, forty-four thousand, one hundred twenty-two".