638371846426 has 4 divisors (see below), whose sum is σ = 957557769642. Its totient is φ = 319185923212.

The previous prime is 638371846391. The next prime is 638371846447. The reversal of 638371846426 is 624648173836.

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

It can be written as a sum of positive squares in only one way, i.e., 632303280625 + 6068565801 = 795175^2 + 77901^2 .

It is a super-2 number, since 2×638371846426² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159592961605 + ... + 159592961608.

Almost surely, 2^638371846426 is an apocalyptic number.

638371846426 is a deficient number, since it is larger than the sum of its proper divisors (319185923216).

638371846426 is a wasteful number, since it uses less digits than its factorization.

638371846426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319185923215.

The product of its digits is 27869184, while the sum is 58.

The spelling of 638371846426 in words is "six hundred thirty-eight billion, three hundred seventy-one million, eight hundred forty-six thousand, four hundred twenty-six".