12638376458 has 4 divisors (see below), whose sum is σ = 18957564690. Its totient is φ = 6319188228.

The previous prime is 12638376337. The next prime is 12638376461. The reversal of 12638376458 is 85467383621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85467383621 = 73 ⋅1170786077.

It can be written as a sum of positive squares in only one way, i.e., 12619601569 + 18774889 = 112337^2 + 4333^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3159594113 + ... + 3159594116.

Almost surely, 2^12638376458 is an apocalyptic number.

12638376458 is a deficient number, since it is larger than the sum of its proper divisors (6319188232).

12638376458 is an equidigital number, since it uses as much as digits as its factorization.

12638376458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6319188231.

The product of its digits is 5806080, while the sum is 53.

The spelling of 12638376458 in words is "twelve billion, six hundred thirty-eight million, three hundred seventy-six thousand, four hundred fifty-eight".