64449556616 has 16 divisors (see below), whose sum is σ = 125009916300. Its totient is φ = 31113578944.

The previous prime is 64449556609. The next prime is 64449556621. The reversal of 64449556616 is 61665594446.

It can be written as a sum of positive squares in 2 ways, for example, as 64437791716 + 11764900 = 253846^2 + 3430^2 .

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, 138899675 + ... + 138900138.

Almost surely, 2^64449556616 is an apocalyptic number.

It is an amenable number.

64449556616 is a deficient number, since it is larger than the sum of its proper divisors (60560359684).

64449556616 is a wasteful number, since it uses less digits than its factorization.

64449556616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277799848 (or 277799844 counting only the distinct ones).

The product of its digits is 18662400, while the sum is 56.

The spelling of 64449556616 in words is "sixty-four billion, four hundred forty-nine million, five hundred fifty-six thousand, six hundred sixteen".