129170340765 has 80 divisors (see below), whose sum is σ = 234133170480. Its totient is φ = 68123980800.

The previous prime is 129170340713. The next prime is 129170340823. The reversal of 129170340765 is 567043071921.

129170340765 is a `hidden beast` number, since 12 + 9 + 170 + 3 + 407 + 65 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 1339779609 + 127830561156 = 36603^2 + 357534^2 .

It is not a de Polignac number, because 129170340765 - 2¹⁰ = 129170339741 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 129170340765.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 46180347 + ... + 46183143.

It is an arithmetic number, because the mean of its divisors is an integer number (2926664631).

Almost surely, 2^129170340765 is an apocalyptic number.

129170340765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129170340765 is a deficient number, since it is larger than the sum of its proper divisors (104962829715).

129170340765 is a wasteful number, since it uses less digits than its factorization.

129170340765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4044 (or 4035 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The spelling of 129170340765 in words is "one hundred twenty-nine billion, one hundred seventy million, three hundred forty thousand, seven hundred sixty-five".