6445538158 has 32 divisors (see below), whose sum is σ = 10019560320. Its totient is φ = 3107393280.

The previous prime is 6445538149. The next prime is 6445538171. The reversal of 6445538158 is 8518355446.

It is a super-3 number, since 3×6445538158³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5235403 + ... + 5236633.

It is an arithmetic number, because the mean of its divisors is an integer number (313111260).

Almost surely, 2^6445538158 is an apocalyptic number.

6445538158 is a deficient number, since it is larger than the sum of its proper divisors (3574022162).

6445538158 is a wasteful number, since it uses less digits than its factorization.

6445538158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1852.

The product of its digits is 2304000, while the sum is 49.

The square root of 6445538158 is about 80284.1090004741. The cubic root of 6445538158 is about 1861.0286596222.

The spelling of 6445538158 in words is "six billion, four hundred forty-five million, five hundred thirty-eight thousand, one hundred fifty-eight".