16205688553 has 2 divisors, whose sum is σ = 16205688554. Its totient is φ = 16205688552.

The previous prime is 16205688547. The next prime is 16205688589. The reversal of 16205688553 is 35588650261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16100564544 + 105124009 = 126888^2 + 10253^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16205688553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16205688497 and 16205688506.

It is not a weakly prime, because it can be changed into another prime (16205688353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8102844276 + 8102844277.

It is an arithmetic number, because the mean of its divisors is an integer number (8102844277).

Almost surely, 2^16205688553 is an apocalyptic number.

It is an amenable number.

16205688553 is a deficient number, since it is larger than the sum of its proper divisors (1).

16205688553 is an equidigital number, since it uses as much as digits as its factorization.

16205688553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728000, while the sum is 49.

The spelling of 16205688553 in words is "sixteen billion, two hundred five million, six hundred eighty-eight thousand, five hundred fifty-three".