6439408961 has 8 divisors (see below), whose sum is σ = 6481272000. Its totient is φ = 6397641360.

The previous prime is 6439408957. The next prime is 6439408979. The reversal of 6439408961 is 1698049346.

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 6439408961 - 2² = 6439408957 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6439408931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114095 + ... + 160923.

It is an arithmetic number, because the mean of its divisors is an integer number (810159000).

Almost surely, 2^6439408961 is an apocalyptic number.

It is an amenable number.

6439408961 is a deficient number, since it is larger than the sum of its proper divisors (41863039).

6439408961 is a wasteful number, since it uses less digits than its factorization.

6439408961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47719.

The product of its (nonzero) digits is 1119744, while the sum is 50.

The square root of 6439408961 is about 80245.9280026096. The cubic root of 6439408961 is about 1860.4385755204.

The spelling of 6439408961 in words is "six billion, four hundred thirty-nine million, four hundred eight thousand, nine hundred sixty-one".