639448412642 has 24 divisors (see below), whose sum is σ = 1039843114596. Its totient is φ = 294785527296.

The previous prime is 639448412591. The next prime is 639448412693. The reversal of 639448412642 is 246214844936.

It is an interprime number because it is at equal distance from previous prime (639448412591) and next prime (639448412693).

It can be written as a sum of positive squares in 6 ways, for example, as 222169879801 + 417278532841 = 471349^2 + 645971^2 .

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 814103 + ... + 1393434.

Almost surely, 2^639448412642 is an apocalyptic number.

639448412642 is a deficient number, since it is larger than the sum of its proper divisors (400394701954).

639448412642 is a wasteful number, since it uses less digits than its factorization.

639448412642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2208422 (or 2208409 counting only the distinct ones).

The product of its digits is 7962624, while the sum is 53.

The spelling of 639448412642 in words is "six hundred thirty-nine billion, four hundred forty-eight million, four hundred twelve thousand, six hundred forty-two".