638351606446 has 4 divisors (see below), whose sum is σ = 957527409672. Its totient is φ = 319175803222.

The previous prime is 638351606441. The next prime is 638351606489. The reversal of 638351606446 is 644606153836.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 638351606393 and 638351606402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638351606441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159587901610 + ... + 159587901613.

It is an arithmetic number, because the mean of its divisors is an integer number (239381852418).

Almost surely, 2^638351606446 is an apocalyptic number.

638351606446 is a deficient number, since it is larger than the sum of its proper divisors (319175803226).

638351606446 is a wasteful number, since it uses less digits than its factorization.

638351606446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319175803225.

The product of its (nonzero) digits is 7464960, while the sum is 52.

The spelling of 638351606446 in words is "six hundred thirty-eight billion, three hundred fifty-one million, six hundred six thousand, four hundred forty-six".