16557446722457 has 2 divisors, whose sum is σ = 16557446722458. Its totient is φ = 16557446722456.

The previous prime is 16557446722307. The next prime is 16557446722469. The reversal of 16557446722457 is 75422764475561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12048368597776 + 4509078124681 = 3471076^2 + 2123459^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16557446722457 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16557446722393 and 16557446722402.

It is not a weakly prime, because it can be changed into another prime (16557446742457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8278723361228 + 8278723361229.

It is an arithmetic number, because the mean of its divisors is an integer number (8278723361229).

Almost surely, 2^{16557446722457} is an apocalyptic number.

It is an amenable number.

16557446722457 is a deficient number, since it is larger than the sum of its proper divisors (1).

16557446722457 is an equidigital number, since it uses as much as digits as its factorization.

16557446722457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 395136000, while the sum is 65.

The spelling of 16557446722457 in words is "sixteen trillion, five hundred fifty-seven billion, four hundred forty-six million, seven hundred twenty-two thousand, four hundred fifty-seven".