16500555161 has 2 divisors, whose sum is σ = 16500555162. Its totient is φ = 16500555160.

The previous prime is 16500555157. The next prime is 16500555167. The reversal of 16500555161 is 16155500561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16178568025 + 321987136 = 127195^2 + 17944^2 .

It is a cyclic number.

It is not a de Polignac number, because 16500555161 - 2² = 16500555157 is a prime.

It is not a weakly prime, because it can be changed into another prime (16500555167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8250277580 + 8250277581.

It is an arithmetic number, because the mean of its divisors is an integer number (8250277581).

Almost surely, 2^16500555161 is an apocalyptic number.

It is an amenable number.

16500555161 is a deficient number, since it is larger than the sum of its proper divisors (1).

16500555161 is an equidigital number, since it uses as much as digits as its factorization.

16500555161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22500, while the sum is 35.

The spelling of 16500555161 in words is "sixteen billion, five hundred million, five hundred fifty-five thousand, one hundred sixty-one".