638653606486 has 16 divisors (see below), whose sum is σ = 1094933134080. Its totient is φ = 273684093480.

The previous prime is 638653606477. The next prime is 638653606489. The reversal of 638653606486 is 684606356836.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638653606489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1887780 + ... + 2200231.

It is an arithmetic number, because the mean of its divisors is an integer number (68433320880).

Almost surely, 2^638653606486 is an apocalyptic number.

638653606486 is a deficient number, since it is larger than the sum of its proper divisors (456279527594).

638653606486 is a wasteful number, since it uses less digits than its factorization.

638653606486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4099179.

The product of its (nonzero) digits is 89579520, while the sum is 61.

The spelling of 638653606486 in words is "six hundred thirty-eight billion, six hundred fifty-three million, six hundred six thousand, four hundred eighty-six".