129217728902769 has 48 divisors (see below), whose sum is σ = 201736853869824. Its totient is φ = 79229264083200.

The previous prime is 129217728902749. The next prime is 129217728902797. The reversal of 129217728902769 is 967209827712921.

129217728902769 is a `hidden beast` number, since 1 + 2 + 9 + 2 + 1 + 77 + 289 + 0 + 276 + 9 = 666.

It is not a de Polignac number, because 129217728902769 - 2²¹ = 129217726805617 is a prime.

It is a super-2 number, since 2×129217728902769² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 129217728902697 and 129217728902706.

It is not an unprimeable number, because it can be changed into a prime (129217728902729) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 427480054 + ... + 427782224.

It is an arithmetic number, because the mean of its divisors is an integer number (4202851122288).

Almost surely, 2^{129217728902769} is an apocalyptic number.

It is an amenable number.

129217728902769 is a deficient number, since it is larger than the sum of its proper divisors (72519124967055).

129217728902769 is a wasteful number, since it uses less digits than its factorization.

129217728902769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315478 (or 315475 counting only the distinct ones).

The product of its (nonzero) digits is 192036096, while the sum is 72.

The spelling of 129217728902769 in words is "one hundred twenty-nine trillion, two hundred seventeen billion, seven hundred twenty-eight million, nine hundred two thousand, seven hundred sixty-nine".