129505746678 has 48 divisors (see below), whose sum is σ = 328689918144. Its totient is φ = 33637855440.

The previous prime is 129505746631. The next prime is 129505746737. The reversal of 129505746678 is 876647505921.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20019300 + ... + 20025767.

It is an arithmetic number, because the mean of its divisors is an integer number (6847706628).

Almost surely, 2^129505746678 is an apocalyptic number.

129505746678 is an abundant number, since it is smaller than the sum of its proper divisors (199184171466).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129505746678 is a wasteful number, since it uses less digits than its factorization.

129505746678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40045097 (or 40045090 counting only the distinct ones).

The product of its (nonzero) digits is 25401600, while the sum is 60.

The spelling of 129505746678 in words is "one hundred twenty-nine billion, five hundred five million, seven hundred forty-six thousand, six hundred seventy-eight".