638604366446 has 4 divisors (see below), whose sum is σ = 957906549672. Its totient is φ = 319302183222.

The previous prime is 638604366419. The next prime is 638604366457. The reversal of 638604366446 is 644663406836.

It is a happy number.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 638604366391 and 638604366400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159651091610 + ... + 159651091613.

It is an arithmetic number, because the mean of its divisors is an integer number (239476637418).

Almost surely, 2^638604366446 is an apocalyptic number.

638604366446 is a deficient number, since it is larger than the sum of its proper divisors (319302183226).

638604366446 is a wasteful number, since it uses less digits than its factorization.

638604366446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319302183225.

The product of its (nonzero) digits is 35831808, while the sum is 56.

The spelling of 638604366446 in words is "six hundred thirty-eight billion, six hundred four million, three hundred sixty-six thousand, four hundred forty-six".