8127664129 has 4 divisors (see below), whose sum is σ = 8752869076. Its totient is φ = 7502459184.

The previous prime is 8127664037. The next prime is 8127664133. The reversal of 8127664129 is 9214667218.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9214667218 = 2 ⋅4607333609.

It can be written as a sum of positive squares in 2 ways, for example, as 648873729 + 7478790400 = 25473^2 + 86480^2 .

It is a cyclic number.

It is not a de Polignac number, because 8127664129 - 2¹³ = 8127655937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8127664159) 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, 312602454 + ... + 312602479.

It is an arithmetic number, because the mean of its divisors is an integer number (2188217269).

Almost surely, 2^8127664129 is an apocalyptic number.

It is an amenable number.

8127664129 is a deficient number, since it is larger than the sum of its proper divisors (625204947).

8127664129 is a wasteful number, since it uses less digits than its factorization.

8127664129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625204946.

The product of its digits is 290304, while the sum is 46.

The square root of 8127664129 is about 90153.5586041949. The cubic root of 8127664129 is about 2010.5825831210.

The spelling of 8127664129 in words is "eight billion, one hundred twenty-seven million, six hundred sixty-four thousand, one hundred twenty-nine".