16449063121 has 2 divisors, whose sum is σ = 16449063122. Its totient is φ = 16449063120.

The previous prime is 16449063119. The next prime is 16449063139. The reversal of 16449063121 is 12136094461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12167193025 + 4281870096 = 110305^2 + 65436^2 .

It is a cyclic number.

It is not a de Polignac number, because 16449063121 - 2¹ = 16449063119 is a prime.

Together with 16449063119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16449063161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8224531560 + 8224531561.

It is an arithmetic number, because the mean of its divisors is an integer number (8224531561).

Almost surely, 2^16449063121 is an apocalyptic number.

It is an amenable number.

16449063121 is a deficient number, since it is larger than the sum of its proper divisors (1).

16449063121 is an equidigital number, since it uses as much as digits as its factorization.

16449063121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 37.

The spelling of 16449063121 in words is "sixteen billion, four hundred forty-nine million, sixty-three thousand, one hundred twenty-one".