638587246466 has 8 divisors (see below), whose sum is σ = 1031564013564. Its totient is φ = 294732575280.

The previous prime is 638587246421. The next prime is 638587246481. The reversal of 638587246466 is 664642785836.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 629174172025 + 9413074441 = 793205^2 + 97021^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 12280523945 + ... + 12280523996.

Almost surely, 2^638587246466 is an apocalyptic number.

638587246466 is a deficient number, since it is larger than the sum of its proper divisors (392976767098).

638587246466 is a wasteful number, since it uses less digits than its factorization.

638587246466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24561047956.

The product of its digits is 278691840, while the sum is 65.

The spelling of 638587246466 in words is "six hundred thirty-eight billion, five hundred eighty-seven million, two hundred forty-six thousand, four hundred sixty-six".