67138989968281 has 32 divisors (see below), whose sum is σ = 83798540616960. Its totient is φ = 52258116556800.

The previous prime is 67138989968279. The next prime is 67138989968287. The reversal of 67138989968281 is 18286998983176.

It is a happy number.

It is not a de Polignac number, because 67138989968281 - 2¹ = 67138989968279 is a prime.

It is a super-2 number, since 2×67138989968281² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67138989968287) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 730035141 + ... + 730127101.

It is an arithmetic number, because the mean of its divisors is an integer number (2618704394280).

Almost surely, 2^{67138989968281} is an apocalyptic number.

It is an amenable number.

67138989968281 is a deficient number, since it is larger than the sum of its proper divisors (16659550648679).

67138989968281 is a wasteful number, since it uses less digits than its factorization.

67138989968281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102385.

The product of its digits is 4514807808, while the sum is 85.

The spelling of 67138989968281 in words is "sixty-seven trillion, one hundred thirty-eight billion, nine hundred eighty-nine million, nine hundred sixty-eight thousand, two hundred eighty-one".