129477445881 has 32 divisors (see below), whose sum is σ = 201067204608. Its totient is φ = 72574656960.

The previous prime is 129477445861. The next prime is 129477445897. The reversal of 129477445881 is 188544774921.

It is a happy number.

It is not a de Polignac number, because 129477445881 - 2¹³ = 129477437689 is a prime.

It is a super-2 number, since 2×129477445881² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (129477445861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6212380 + ... + 6233186.

It is an arithmetic number, because the mean of its divisors is an integer number (6283350144).

Almost surely, 2^129477445881 is an apocalyptic number.

It is an amenable number.

129477445881 is a deficient number, since it is larger than the sum of its proper divisors (71589758727).

129477445881 is a wasteful number, since it uses less digits than its factorization.

129477445881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26461.

The product of its digits is 18063360, while the sum is 60.

The spelling of 129477445881 in words is "one hundred twenty-nine billion, four hundred seventy-seven million, four hundred forty-five thousand, eight hundred eighty-one".