74639388839 has 2 divisors, whose sum is σ = 74639388840. Its totient is φ = 74639388838.

The previous prime is 74639388797. The next prime is 74639388907. The reversal of 74639388839 is 93888393647.

It is an a-pointer prime, because the next prime (74639388907) can be obtained adding 74639388839 to its sum of digits (68).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 74639388839 - 2²⁸ = 74370953383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74639388139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37319694419 + 37319694420.

It is an arithmetic number, because the mean of its divisors is an integer number (37319694420).

Almost surely, 2^74639388839 is an apocalyptic number.

74639388839 is a deficient number, since it is larger than the sum of its proper divisors (1).

74639388839 is an equidigital number, since it uses as much as digits as its factorization.

74639388839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 188116992, while the sum is 68.

The spelling of 74639388839 in words is "seventy-four billion, six hundred thirty-nine million, three hundred eighty-eight thousand, eight hundred thirty-nine".