129477734847 has 16 divisors (see below), whose sum is σ = 194129940480. Its totient is φ = 85278506616.

The previous prime is 129477734839. The next prime is 129477734863. The reversal of 129477734847 is 748437774921.

129477734847 is a `hidden beast` number, since 12 + 9 + 4 + 77 + 73 + 484 + 7 = 666.

It is not a de Polignac number, because 129477734847 - 2³ = 129477734839 is a prime.

It is a super-2 number, since 2×129477734847² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129477734807) by changing a digit.

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, 28886143 + ... + 28890624.

It is an arithmetic number, because the mean of its divisors is an integer number (12133121280).

Almost surely, 2^129477734847 is an apocalyptic number.

129477734847 is a deficient number, since it is larger than the sum of its proper divisors (64652205633).

129477734847 is an equidigital number, since it uses as much as digits as its factorization.

129477734847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57776859 (or 57776853 counting only the distinct ones).

The product of its digits is 66382848, while the sum is 63.

The spelling of 129477734847 in words is "one hundred twenty-nine billion, four hundred seventy-seven million, seven hundred thirty-four thousand, eight hundred forty-seven".