129695728481 has 16 divisors (see below), whose sum is σ = 141838501056. Its totient is φ = 117612000000.

The previous prime is 129695728451. The next prime is 129695728493. The reversal of 129695728481 is 184827596921.

It is not a de Polignac number, because 129695728481 - 2¹⁰ = 129695727457 is a prime.

It is a super-2 number, since 2×129695728481² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129695728441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8725706 + ... + 8740556.

It is an arithmetic number, because the mean of its divisors is an integer number (8864906316).

Almost surely, 2^129695728481 is an apocalyptic number.

129695728481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

129695728481 is a deficient number, since it is larger than the sum of its proper divisors (12142772575).

129695728481 is a wasteful number, since it uses less digits than its factorization.

129695728481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16784.

The product of its digits is 17418240, while the sum is 62.

The spelling of 129695728481 in words is "one hundred twenty-nine billion, six hundred ninety-five million, seven hundred twenty-eight thousand, four hundred eighty-one".