73638471321 has 6 divisors (see below), whose sum is σ = 106366680810. Its totient is φ = 49092314208.

The previous prime is 73638471301. The next prime is 73638471331. The reversal of 73638471321 is 12317483637.

73638471321 is a `hidden beast` number, since 7 + 3 + 638 + 4 + 7 + 1 + 3 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 55016048025 + 18622423296 = 234555^2 + 136464^2 .

It is not a de Polignac number, because 73638471321 - 2⁵ = 73638471289 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (73638471301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4091026176 + ... + 4091026193.

It is an arithmetic number, because the mean of its divisors is an integer number (17727780135).

Almost surely, 2^73638471321 is an apocalyptic number.

It is an amenable number.

73638471321 is a deficient number, since it is larger than the sum of its proper divisors (32728209489).

73638471321 is a wasteful number, since it uses less digits than its factorization.

73638471321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8182052375 (or 8182052372 counting only the distinct ones).

The product of its digits is 508032, while the sum is 45.

The spelling of 73638471321 in words is "seventy-three billion, six hundred thirty-eight million, four hundred seventy-one thousand, three hundred twenty-one".