67961909221 has 4 divisors (see below), whose sum is σ = 67962443200. Its totient is φ = 67961375244.

The previous prime is 67961909201. The next prime is 67961909227. The reversal of 67961909221 is 12290916976.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 67961909221 - 2⁹ = 67961908709 is a prime.

It is a super-2 number, since 2×67961909221² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67961909227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47050 + ... + 371668.

It is an arithmetic number, because the mean of its divisors is an integer number (16990610800).

Almost surely, 2^67961909221 is an apocalyptic number.

It is an amenable number.

67961909221 is a deficient number, since it is larger than the sum of its proper divisors (533979).

67961909221 is a wasteful number, since it uses less digits than its factorization.

67961909221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533978.

The product of its (nonzero) digits is 734832, while the sum is 52.

The spelling of 67961909221 in words is "sixty-seven billion, nine hundred sixty-one million, nine hundred nine thousand, two hundred twenty-one".