129669831785 has 16 divisors (see below), whose sum is σ = 167783643216. Its totient is φ = 95635999488.

The previous prime is 129669831773. The next prime is 129669831847. The reversal of 129669831785 is 587138966921.

It can be written as a sum of positive squares in 8 ways, for example, as 5458697689 + 124211134096 = 73883^2 + 352436^2 .

It is a cyclic number.

It is not a de Polignac number, because 129669831785 - 2⁶ = 129669831721 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (65).

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1199714 + ... + 1303323.

It is an arithmetic number, because the mean of its divisors is an integer number (10486477701).

Almost surely, 2^129669831785 is an apocalyptic number.

It is an amenable number.

129669831785 is a deficient number, since it is larger than the sum of its proper divisors (38113811431).

129669831785 is a wasteful number, since it uses less digits than its factorization.

129669831785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2503852.

The product of its digits is 39191040, while the sum is 65.

The spelling of 129669831785 in words is "one hundred twenty-nine billion, six hundred sixty-nine million, eight hundred thirty-one thousand, seven hundred eighty-five".