16434063721 has 2 divisors, whose sum is σ = 16434063722. Its totient is φ = 16434063720.

The previous prime is 16434063683. The next prime is 16434063731. The reversal of 16434063721 is 12736043461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16332840000 + 101223721 = 127800^2 + 10061^2 .

It is a cyclic number.

It is not a de Polignac number, because 16434063721 - 2⁷ = 16434063593 is a prime.

It is not a weakly prime, because it can be changed into another prime (16434063731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8217031860 + 8217031861.

It is an arithmetic number, because the mean of its divisors is an integer number (8217031861).

Almost surely, 2^16434063721 is an apocalyptic number.

It is an amenable number.

16434063721 is a deficient number, since it is larger than the sum of its proper divisors (1).

16434063721 is an equidigital number, since it uses as much as digits as its factorization.

16434063721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 37.

The spelling of 16434063721 in words is "sixteen billion, four hundred thirty-four million, sixty-three thousand, seven hundred twenty-one".