129072777779 has 4 divisors (see below), whose sum is σ = 140806666680. Its totient is φ = 117338888880.

The previous prime is 129072777733. The next prime is 129072777781. The reversal of 129072777779 is 977777270921.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129072777779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129072777709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5866944434 + ... + 5866944455.

It is an arithmetic number, because the mean of its divisors is an integer number (35201666670).

Almost surely, 2^129072777779 is an apocalyptic number.

129072777779 is a deficient number, since it is larger than the sum of its proper divisors (11733888901).

129072777779 is a wasteful number, since it uses less digits than its factorization.

129072777779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11733888900.

The product of its (nonzero) digits is 38118276, while the sum is 65.

The spelling of 129072777779 in words is "one hundred twenty-nine billion, seventy-two million, seven hundred seventy-seven thousand, seven hundred seventy-nine".