638634453327 has 40 divisors (see below), whose sum is σ = 1027632602304. Its totient is φ = 392914867392.

The previous prime is 638634453283. The next prime is 638634453341. The reversal of 638634453327 is 723354436836.

638634453327 is a `hidden beast` number, since 6 + 3 + 8 + 63 + 44 + 533 + 2 + 7 = 666.

It is not a de Polignac number, because 638634453327 - 2⁸ = 638634453071 is a prime.

It is a super-2 number, since 2×638634453327² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638634453427) by changing a digit.

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 in 39 ways as a sum of consecutive naturals, for example, 4631593 + ... + 4767485.

Almost surely, 2^638634453327 is an apocalyptic number.

638634453327 is a deficient number, since it is larger than the sum of its proper divisors (388998148977).

638634453327 is a wasteful number, since it uses less digits than its factorization.

638634453327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140381 (or 140372 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 54.

The spelling of 638634453327 in words is "six hundred thirty-eight billion, six hundred thirty-four million, four hundred fifty-three thousand, three hundred twenty-seven".