6644506145 has 8 divisors (see below), whose sum is σ = 7974510504. Its totient is φ = 5314869504.

The previous prime is 6644506097. The next prime is 6644506147. The reversal of 6644506145 is 5416054466.

It can be written as a sum of positive squares in 4 ways, for example, as 1380568336 + 5263937809 = 37156^2 + 72553^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 6644506145 - 2¹⁸ = 6644244001 is a prime.

It is a super-2 number, since 2×6644506145² = 88298923821885522050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6644506147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50474 + ... + 125843.

It is an arithmetic number, because the mean of its divisors is an integer number (996813813).

Almost surely, 2^6644506145 is an apocalyptic number.

It is an amenable number.

6644506145 is a deficient number, since it is larger than the sum of its proper divisors (1330004359).

6644506145 is a wasteful number, since it uses less digits than its factorization.

6644506145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183859.

The product of its (nonzero) digits is 345600, while the sum is 41.

The square root of 6644506145 is about 81513.8402052069. The cubic root of 6644506145 is about 1879.9843578938.

The spelling of 6644506145 in words is "six billion, six hundred forty-four million, five hundred six thousand, one hundred forty-five".