639448412641 has 8 divisors (see below), whose sum is σ = 650746108224. Its totient is φ = 628214366640.

The previous prime is 639448412591. The next prime is 639448412693. The reversal of 639448412641 is 146214844936.

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 639448412641 - 2⁷ = 639448412513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (639448412341) 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, 15892126 + ... + 15932311.

It is an arithmetic number, because the mean of its divisors is an integer number (81343263528).

Almost surely, 2^639448412641 is an apocalyptic number.

It is an amenable number.

639448412641 is a deficient number, since it is larger than the sum of its proper divisors (11297695583).

639448412641 is a wasteful number, since it uses less digits than its factorization.

639448412641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31824791.

The product of its digits is 3981312, while the sum is 52.

The spelling of 639448412641 in words is "six hundred thirty-nine billion, four hundred forty-eight million, four hundred twelve thousand, six hundred forty-one".