6489129657 has 4 divisors (see below), whose sum is σ = 8652172880. Its totient is φ = 4326086436.

The previous prime is 6489129629. The next prime is 6489129707. The reversal of 6489129657 is 7569219846.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-6489129657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6489129597 and 6489129606.

It is not an unprimeable number, because it can be changed into a prime (6489129617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1081521607 + ... + 1081521612.

It is an arithmetic number, because the mean of its divisors is an integer number (2163043220).

Almost surely, 2^6489129657 is an apocalyptic number.

It is an amenable number.

6489129657 is a deficient number, since it is larger than the sum of its proper divisors (2163043223).

6489129657 is a wasteful number, since it uses less digits than its factorization.

6489129657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2163043222.

The product of its digits is 6531840, while the sum is 57.

The square root of 6489129657 is about 80555.1342684003. The cubic root of 6489129657 is about 1865.2146472419.

The spelling of 6489129657 in words is "six billion, four hundred eighty-nine million, one hundred twenty-nine thousand, six hundred fifty-seven".