638376212638 has 8 divisors (see below), whose sum is σ = 999197550288. Its totient is φ = 305310362544.

The previous prime is 638376212629. The next prime is 638376212659. The reversal of 638376212638 is 836212673836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6938871831 + ... + 6938871922.

It is an arithmetic number, because the mean of its divisors is an integer number (124899693786).

Almost surely, 2^638376212638 is an apocalyptic number.

638376212638 is a deficient number, since it is larger than the sum of its proper divisors (360821337650).

638376212638 is a wasteful number, since it uses less digits than its factorization.

638376212638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13877743778.

The product of its digits is 10450944, while the sum is 55.

The spelling of 638376212638 in words is "six hundred thirty-eight billion, three hundred seventy-six million, two hundred twelve thousand, six hundred thirty-eight".