944251800721 has 2 divisors, whose sum is σ = 944251800722. Its totient is φ = 944251800720.

The previous prime is 944251800671. The next prime is 944251800749. The reversal of 944251800721 is 127008152449.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 943268288400 + 983512321 = 971220^2 + 31361^2 .

It is a cyclic number.

It is not a de Polignac number, because 944251800721 - 2⁹ = 944251800209 is a prime.

It is a super-2 number, since 2×944251800721² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (944251800421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 472125900360 + 472125900361.

It is an arithmetic number, because the mean of its divisors is an integer number (472125900361).

Almost surely, 2^944251800721 is an apocalyptic number.

It is an amenable number.

944251800721 is a deficient number, since it is larger than the sum of its proper divisors (1).

944251800721 is an equidigital number, since it uses as much as digits as its factorization.

944251800721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 43.

The spelling of 944251800721 in words is "nine hundred forty-four billion, two hundred fifty-one million, eight hundred thousand, seven hundred twenty-one".