64556217444 has 12 divisors (see below), whose sum is σ = 150631174064. Its totient is φ = 21518739144.

The previous prime is 64556217419. The next prime is 64556217457. The reversal of 64556217444 is 44471265546.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×64556217444³ (a number of 33 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64556217393 and 64556217402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2689842382 + ... + 2689842405.

Almost surely, 2^64556217444 is an apocalyptic number.

It is an amenable number.

64556217444 is an abundant number, since it is smaller than the sum of its proper divisors (86074956620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64556217444 is a wasteful number, since it uses less digits than its factorization.

64556217444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5379684794 (or 5379684792 counting only the distinct ones).

The product of its digits is 3225600, while the sum is 48.

The spelling of 64556217444 in words is "sixty-four billion, five hundred fifty-six million, two hundred seventeen thousand, four hundred forty-four".