129550397471664 has 160 divisors (see below), whose sum is σ = 360797286704064. Its totient is φ = 39819490099200.

The previous prime is 129550397471657. The next prime is 129550397471701. The reversal of 129550397471664 is 466174793055921.

It is a super-2 number, since 2×129550397471664² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3645900042 + ... + 3645935574.

Almost surely, 2^{129550397471664} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129550397471664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180398643352032).

129550397471664 is an abundant number, since it is smaller than the sum of its proper divisors (231246889232400).

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

129550397471664 is a wasteful number, since it uses less digits than its factorization.

129550397471664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41575 (or 41569 counting only the distinct ones).

The product of its (nonzero) digits is 342921600, while the sum is 69.

The spelling of 129550397471664 in words is "one hundred twenty-nine trillion, five hundred fifty billion, three hundred ninety-seven million, four hundred seventy-one thousand, six hundred sixty-four".