8129669861 has 8 divisors (see below), whose sum is σ = 8562417984. Its totient is φ = 7703528800.

The previous prime is 8129669831. The next prime is 8129669939. The reversal of 8129669861 is 1689669218.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8129669861 - 2¹⁰ = 8129668837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8129669797 and 8129669806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8129669831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1649240 + ... + 1654161.

It is an arithmetic number, because the mean of its divisors is an integer number (1070302248).

Almost surely, 2^8129669861 is an apocalyptic number.

It is an amenable number.

8129669861 is a deficient number, since it is larger than the sum of its proper divisors (432748123).

8129669861 is a wasteful number, since it uses less digits than its factorization.

8129669861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3303531.

The product of its digits is 2239488, while the sum is 56.

The square root of 8129669861 is about 90164.6818937437. The cubic root of 8129669861 is about 2010.7479589732.

The spelling of 8129669861 in words is "eight billion, one hundred twenty-nine million, six hundred sixty-nine thousand, eight hundred sixty-one".