638843043158 has 8 divisors (see below), whose sum is σ = 981636871320. Its totient is φ = 311630752720.

The previous prime is 638843043103. The next prime is 638843043161. The reversal of 638843043158 is 851340348836.

It is a happy number.

638843043158 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×638843043158² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3895384328 + ... + 3895384491.

It is an arithmetic number, because the mean of its divisors is an integer number (122704608915).

Almost surely, 2^638843043158 is an apocalyptic number.

638843043158 is a deficient number, since it is larger than the sum of its proper divisors (342793828162).

638843043158 is a wasteful number, since it uses less digits than its factorization.

638843043158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7790768862.

The product of its (nonzero) digits is 6635520, while the sum is 53.

The spelling of 638843043158 in words is "six hundred thirty-eight billion, eight hundred forty-three million, forty-three thousand, one hundred fifty-eight".