16451444364809 has 2 divisors, whose sum is σ = 16451444364810. Its totient is φ = 16451444364808.

The previous prime is 16451444364767. The next prime is 16451444364857. The reversal of 16451444364809 is 90846344415461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8792648257600 + 7658796107209 = 2965240^2 + 2767453^2 .

It is a cyclic number.

It is not a de Polignac number, because 16451444364809 - 2³⁶ = 16382724888073 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (16451444364869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8225722182404 + 8225722182405.

It is an arithmetic number, because the mean of its divisors is an integer number (8225722182405).

Almost surely, 2^{16451444364809} is an apocalyptic number.

It is an amenable number.

16451444364809 is a deficient number, since it is larger than the sum of its proper divisors (1).

16451444364809 is an equidigital number, since it uses as much as digits as its factorization.

16451444364809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39813120, while the sum is 59.

The spelling of 16451444364809 in words is "sixteen trillion, four hundred fifty-one billion, four hundred forty-four million, three hundred sixty-four thousand, eight hundred nine".