6444135538 has 8 divisors (see below), whose sum is σ = 10086473088. Its totient is φ = 3081977844.

The previous prime is 6444135527. The next prime is 6444135541. The reversal of 6444135538 is 8355314446.

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

It is a super-2 number, since 2×6444135538² = 83053765664229098888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6444135494 and 6444135503.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70044906 + ... + 70044997.

It is an arithmetic number, because the mean of its divisors is an integer number (1260809136).

Almost surely, 2^6444135538 is an apocalyptic number.

6444135538 is a deficient number, since it is larger than the sum of its proper divisors (3642337550).

6444135538 is a wasteful number, since it uses less digits than its factorization.

6444135538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140089928.

The product of its digits is 691200, while the sum is 43.

The square root of 6444135538 is about 80275.3731725988. The cubic root of 6444135538 is about 1860.8936563935.

The spelling of 6444135538 in words is "six billion, four hundred forty-four million, one hundred thirty-five thousand, five hundred thirty-eight".