129505746679 has 4 divisors (see below), whose sum is σ = 129513550320. Its totient is φ = 129497943040.

The previous prime is 129505746631. The next prime is 129505746737. The reversal of 129505746679 is 976647505921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129505746679 - 2¹³ = 129505738487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129505741679) 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, 3876874 + ... + 3910135.

It is an arithmetic number, because the mean of its divisors is an integer number (32378387580).

Almost surely, 2^129505746679 is an apocalyptic number.

129505746679 is a deficient number, since it is larger than the sum of its proper divisors (7803641).

129505746679 is an equidigital number, since it uses as much as digits as its factorization.

129505746679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7803640.

The product of its (nonzero) digits is 28576800, while the sum is 61.

The spelling of 129505746679 in words is "one hundred twenty-nine billion, five hundred five million, seven hundred forty-six thousand, six hundred seventy-nine".