67657732321 has 3 divisors (see below), whose sum is σ = 67657992433. Its totient is φ = 67657472210.

The previous prime is 67657732291. The next prime is 67657732327. The reversal of 67657732321 is 12323775676.

The square root of 67657732321 is 260111.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 67657732321 - 2¹³ = 67657724129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67657732327) 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 2 ways as a sum of consecutive naturals, for example, 130056 + ... + 390166.

Almost surely, 2^67657732321 is an apocalyptic number.

67657732321 is the 260111-st square number.

67657732321 is the 130056-th centered octagonal number.

It is an amenable number.

67657732321 is a deficient number, since it is larger than the sum of its proper divisors (260112).

67657732321 is an frugal number, since it uses more digits than its factorization.

67657732321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520222 (or 260111 counting only the distinct ones).

The product of its digits is 2222640, while the sum is 49.

Multiplying 67657732321 by its sum of digits (49), we get a square (3315228883729 = 1820777²).

The spelling of 67657732321 in words is "sixty-seven billion, six hundred fifty-seven million, seven hundred thirty-two thousand, three hundred twenty-one".