129780215795 has 16 divisors (see below), whose sum is σ = 161298648000. Its totient is φ = 100124454528.

The previous prime is 129780215723. The next prime is 129780215819. The reversal of 129780215795 is 597512087921.

It is a cyclic number.

It is not a de Polignac number, because 129780215795 - 2¹⁴ = 129780199411 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129780215795.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 411740 + ... + 655049.

It is an arithmetic number, because the mean of its divisors is an integer number (10081165500).

Almost surely, 2^129780215795 is an apocalyptic number.

129780215795 is a deficient number, since it is larger than the sum of its proper divisors (31518432205).

129780215795 is a wasteful number, since it uses less digits than its factorization.

129780215795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1067662.

The product of its (nonzero) digits is 3175200, while the sum is 56.

The spelling of 129780215795 in words is "one hundred twenty-nine billion, seven hundred eighty million, two hundred fifteen thousand, seven hundred ninety-five".