67636819331 has 2 divisors, whose sum is σ = 67636819332. Its totient is φ = 67636819330.

The previous prime is 67636819319. The next prime is 67636819333. The reversal of 67636819331 is 13391863676.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 67636819331 - 2³⁰ = 66563077507 is a prime.

It is a super-2 number, since 2×67636819331² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 67636819333, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (67636819333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33818409665 + 33818409666.

It is an arithmetic number, because the mean of its divisors is an integer number (33818409666).

Almost surely, 2^67636819331 is an apocalyptic number.

67636819331 is a deficient number, since it is larger than the sum of its proper divisors (1).

67636819331 is an equidigital number, since it uses as much as digits as its factorization.

67636819331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2939328, while the sum is 53.

The spelling of 67636819331 in words is "sixty-seven billion, six hundred thirty-six million, eight hundred nineteen thousand, three hundred thirty-one".