73971720839279 has 2 divisors, whose sum is σ = 73971720839280. Its totient is φ = 73971720839278.

The previous prime is 73971720839207. The next prime is 73971720839281. The reversal of 73971720839279 is 97293802717937.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73971720839279 is a prime.

It is a Sophie Germain prime.

Together with 73971720839281, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73971720809279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36985860419639 + 36985860419640.

It is an arithmetic number, because the mean of its divisors is an integer number (36985860419640).

Almost surely, 2^{73971720839279} is an apocalyptic number.

73971720839279 is a deficient number, since it is larger than the sum of its proper divisors (1).

73971720839279 is an equidigital number, since it uses as much as digits as its factorization.

73971720839279 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504094752, while the sum is 74.

The spelling of 73971720839279 in words is "seventy-three trillion, nine hundred seventy-one billion, seven hundred twenty million, eight hundred thirty-nine thousand, two hundred seventy-nine".