6544456138 has 32 divisors (see below), whose sum is σ = 10876821120. Its totient is φ = 2928519360.

The previous prime is 6544456123. The next prime is 6544456147. The reversal of 6544456138 is 8316544456.

It is a super-2 number, since 2×6544456138² = 85659812284411750088, which contains 22 as substring.

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, 367795 + ... + 385177.

It is an arithmetic number, because the mean of its divisors is an integer number (339900660).

Almost surely, 2^6544456138 is an apocalyptic number.

6544456138 is a deficient number, since it is larger than the sum of its proper divisors (4332364982).

6544456138 is a wasteful number, since it uses less digits than its factorization.

6544456138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17662.

The product of its digits is 1382400, while the sum is 46.

The square root of 6544456138 is about 80897.8129370628. The cubic root of 6544456138 is about 1870.5006083445.

The spelling of 6544456138 in words is "six billion, five hundred forty-four million, four hundred fifty-six thousand, one hundred thirty-eight".