744230665021 has 4 divisors (see below), whose sum is σ = 788008939452. Its totient is φ = 700452390592.

The previous prime is 744230664997. The next prime is 744230665039. The reversal of 744230665021 is 120566032447.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 198279621796 + 545951043225 = 445286^2 + 738885^2 .

It is a cyclic number.

It is not a de Polignac number, because 744230665021 - 2²¹ = 744228567869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (744230665091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21889137190 + ... + 21889137223.

It is an arithmetic number, because the mean of its divisors is an integer number (197002234863).

Almost surely, 2^744230665021 is an apocalyptic number.

It is an amenable number.

744230665021 is a deficient number, since it is larger than the sum of its proper divisors (43778274431).

744230665021 is a wasteful number, since it uses less digits than its factorization.

744230665021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43778274430.

The product of its (nonzero) digits is 241920, while the sum is 40.

Adding to 744230665021 its reverse (120566032447), we get a palindrome (864796697468).

The spelling of 744230665021 in words is "seven hundred forty-four billion, two hundred thirty million, six hundred sixty-five thousand, twenty-one".