16228495981 has 2 divisors, whose sum is σ = 16228495982. Its totient is φ = 16228495980.

The previous prime is 16228495957. The next prime is 16228495993. The reversal of 16228495981 is 18959482261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15341051881 + 887444100 = 123859^2 + 29790^2 .

It is a cyclic number.

It is not a de Polignac number, because 16228495981 - 2¹⁵ = 16228463213 is a prime.

It is a super-2 number, since 2×16228495981² (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 (16228495931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8114247990 + 8114247991.

It is an arithmetic number, because the mean of its divisors is an integer number (8114247991).

Almost surely, 2^16228495981 is an apocalyptic number.

It is an amenable number.

16228495981 is a deficient number, since it is larger than the sum of its proper divisors (1).

16228495981 is an equidigital number, since it uses as much as digits as its factorization.

16228495981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2488320, while the sum is 55.

The spelling of 16228495981 in words is "sixteen billion, two hundred twenty-eight million, four hundred ninety-five thousand, nine hundred eighty-one".