16563522257 has 2 divisors, whose sum is σ = 16563522258. Its totient is φ = 16563522256.

The previous prime is 16563522253. The next prime is 16563522307. The reversal of 16563522257 is 75222536561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9494748481 + 7068773776 = 97441^2 + 84076^2 .

It is a cyclic number.

It is not a de Polignac number, because 16563522257 - 2² = 16563522253 is a prime.

It is not a weakly prime, because it can be changed into another prime (16563522253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8281761128 + 8281761129.

It is an arithmetic number, because the mean of its divisors is an integer number (8281761129).

Almost surely, 2^16563522257 is an apocalyptic number.

It is an amenable number.

16563522257 is a deficient number, since it is larger than the sum of its proper divisors (1).

16563522257 is an equidigital number, since it uses as much as digits as its factorization.

16563522257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 756000, while the sum is 44.

The spelling of 16563522257 in words is "sixteen billion, five hundred sixty-three million, five hundred twenty-two thousand, two hundred fifty-seven".