1644226563 has 8 divisors (see below), whose sum is σ = 2505488128. Its totient is φ = 939558024.

The previous prime is 1644226559. The next prime is 1644226583. The reversal of 1644226563 is 3656224461.

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

It is not a de Polignac number, because 1644226563 - 2² = 1644226559 is a prime.

It is a super-3 number, since 3×1644226563³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1644226583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39148231 + ... + 39148272.

It is an arithmetic number, because the mean of its divisors is an integer number (313186016).

Almost surely, 2^1644226563 is an apocalyptic number.

1644226563 is a deficient number, since it is larger than the sum of its proper divisors (861261565).

1644226563 is an equidigital number, since it uses as much as digits as its factorization.

1644226563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78296513.

The product of its digits is 207360, while the sum is 39.

The square root of 1644226563 is about 40549.0636513348. The cubic root of 1644226563 is about 1180.2859029051.

The spelling of 1644226563 in words is "one billion, six hundred forty-four million, two hundred twenty-six thousand, five hundred sixty-three".