16500802181 has 2 divisors, whose sum is σ = 16500802182. Its totient is φ = 16500802180.

The previous prime is 16500802169. The next prime is 16500802243. The reversal of 16500802181 is 18120800561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15598761025 + 902041156 = 124895^2 + 30034^2 .

It is a cyclic number.

It is not a de Polignac number, because 16500802181 - 2¹⁴ = 16500785797 is a prime.

It is a super-2 number, since 2×16500802181² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16500802081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8250401090 + 8250401091.

It is an arithmetic number, because the mean of its divisors is an integer number (8250401091).

Almost surely, 2^16500802181 is an apocalyptic number.

It is an amenable number.

16500802181 is a deficient number, since it is larger than the sum of its proper divisors (1).

16500802181 is an equidigital number, since it uses as much as digits as its factorization.

16500802181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 32.

The spelling of 16500802181 in words is "sixteen billion, five hundred million, eight hundred two thousand, one hundred eighty-one".