1244441665 has 8 divisors (see below), whose sum is σ = 1496658600. Its totient is φ = 993334272.

The previous prime is 1244441623. The next prime is 1244441687. The reversal of 1244441665 is 5661444421.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 268566544 + 975875121 = 16388^2 + 31239^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1244441665 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 274914 + ... + 279403.

It is an arithmetic number, because the mean of its divisors is an integer number (187082325).

Almost surely, 2^1244441665 is an apocalyptic number.

It is an amenable number.

1244441665 is a deficient number, since it is larger than the sum of its proper divisors (252216935).

1244441665 is an equidigital number, since it uses as much as digits as its factorization.

1244441665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554771.

The product of its digits is 92160, while the sum is 37.

The square root of 1244441665 is about 35276.6447525838. The cubic root of 1244441665 is about 1075.6182965571.

The spelling of 1244441665 in words is "one billion, two hundred forty-four million, four hundred forty-one thousand, six hundred sixty-five".