129677618149 has 4 divisors (see below), whose sum is σ = 130394069260. Its totient is φ = 128961167040.

The previous prime is 129677618131. The next prime is 129677618197. The reversal of 129677618149 is 941816776921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 941816776921 = 59 ⋅15962996219.

It can be written as a sum of positive squares in 2 ways, for example, as 6065605924 + 123612012225 = 77882^2 + 351585^2 .

It is a cyclic number.

It is not a de Polignac number, because 129677618149 - 2⁹ = 129677617637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129677618249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 358225284 + ... + 358225645.

It is an arithmetic number, because the mean of its divisors is an integer number (32598517315).

Almost surely, 2^129677618149 is an apocalyptic number.

It is an amenable number.

129677618149 is a deficient number, since it is larger than the sum of its proper divisors (716451111).

129677618149 is an equidigital number, since it uses as much as digits as its factorization.

129677618149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716451110.

The product of its digits is 9144576, while the sum is 61.

The spelling of 129677618149 in words is "one hundred twenty-nine billion, six hundred seventy-seven million, six hundred eighteen thousand, one hundred forty-nine".