129477731898 has 16 divisors (see below), whose sum is σ = 258959076480. Its totient is φ = 43158641856.

The previous prime is 129477731863. The next prime is 129477731939. The reversal of 129477731898 is 898137774921.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 614386 + ... + 797762.

It is an arithmetic number, because the mean of its divisors is an integer number (16184942280).

Almost surely, 2^129477731898 is an apocalyptic number.

129477731898 is an abundant number, since it is smaller than the sum of its proper divisors (129481344582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129477731898 is a wasteful number, since it uses less digits than its factorization.

129477731898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301061.

The product of its digits is 42674688, while the sum is 66.

The spelling of 129477731898 in words is "one hundred twenty-nine billion, four hundred seventy-seven million, seven hundred thirty-one thousand, eight hundred ninety-eight".