644466614146 has 8 divisors (see below), whose sum is σ = 990277968204. Its totient is φ = 314373958080.

The previous prime is 644466614131. The next prime is 644466614219. The reversal of 644466614146 is 641416664446.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 595229223121 + 49237391025 = 771511^2 + 221895^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 644466614093 and 644466614102.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3929674395 + ... + 3929674558.

Almost surely, 2^644466614146 is an apocalyptic number.

644466614146 is a deficient number, since it is larger than the sum of its proper divisors (345811354058).

644466614146 is a wasteful number, since it uses less digits than its factorization.

644466614146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7859348996.

The product of its digits is 7962624, while the sum is 52.

The spelling of 644466614146 in words is "six hundred forty-four billion, four hundred sixty-six million, six hundred fourteen thousand, one hundred forty-six".