67839932521 has 3 divisors (see below), whose sum is σ = 67840192983. Its totient is φ = 67839672060.

The previous prime is 67839932483. The next prime is 67839932533. The reversal of 67839932521 is 12523993876.

The square root of 67839932521 is 260461.

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 can be written as a sum of positive squares in only one way, i.e., 67464348121 + 375584400 = 259739^2 + 19380^2 .

It is not a de Polignac number, because 67839932521 - 2⁹ = 67839932009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67839932581) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 130231 + ... + 390691.

It is an arithmetic number, because the mean of its divisors is an integer number (22613397661).

Almost surely, 2^67839932521 is an apocalyptic number.

67839932521 is the 260461-st square number.

67839932521 is the 130231-st centered octagonal number.

It is an amenable number.

67839932521 is a deficient number, since it is larger than the sum of its proper divisors (260462).

67839932521 is an frugal number, since it uses more digits than its factorization.

67839932521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520922 (or 260461 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 55.

The spelling of 67839932521 in words is "sixty-seven billion, eight hundred thirty-nine million, nine hundred thirty-two thousand, five hundred twenty-one".