638353663071 has 16 divisors (see below), whose sum is σ = 875675241984. Its totient is φ = 413474618304.

The previous prime is 638353663067. The next prime is 638353663127. The reversal of 638353663071 is 170366353836.

It is not a de Polignac number, because 638353663071 - 2² = 638353663067 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638353663021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21737991 + ... + 21767336.

It is an arithmetic number, because the mean of its divisors is an integer number (54729702624).

Almost surely, 2^638353663071 is an apocalyptic number.

638353663071 is a deficient number, since it is larger than the sum of its proper divisors (237321578913).

638353663071 is a wasteful number, since it uses less digits than its factorization.

638353663071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43505470.

The product of its (nonzero) digits is 4898880, while the sum is 51.

The spelling of 638353663071 in words is "six hundred thirty-eight billion, three hundred fifty-three million, six hundred sixty-three thousand, seventy-one".