444153053853721 has 3 divisors (see below), whose sum is σ = 444153074928661. Its totient is φ = 444153032778782.

The previous prime is 444153053853709. The next prime is 444153053853727. The reversal of 444153053853721 is 127358350351444.

The square root of 444153053853721 is 21074939.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 444153053853721 - 2⁵ = 444153053853689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (444153053853727) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 10537470 + ... + 31612408.

Almost surely, 2^{444153053853721} is an apocalyptic number.

444153053853721 is the 21074939-th square number.

444153053853721 is the 10537470-th centered octagonal number.

It is an amenable number.

444153053853721 is a deficient number, since it is larger than the sum of its proper divisors (21074940).

444153053853721 is an frugal number, since it uses more digits than its factorization.

444153053853721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42149878 (or 21074939 counting only the distinct ones).

The product of its (nonzero) digits is 24192000, while the sum is 55.

The spelling of 444153053853721 in words is "four hundred forty-four trillion, one hundred fifty-three billion, fifty-three million, eight hundred fifty-three thousand, seven hundred twenty-one".