19616244481 has 2 divisors, whose sum is σ = 19616244482. Its totient is φ = 19616244480.

The previous prime is 19616244469. The next prime is 19616244509. The reversal of 19616244481 is 18444261691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18491648256 + 1124596225 = 135984^2 + 33535^2 .

It is an emirp because it is prime and its reverse (18444261691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19616244481 - 2¹¹ = 19616242433 is a prime.

It is a super-2 number, since 2×19616244481² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19616244281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9808122240 + 9808122241.

It is an arithmetic number, because the mean of its divisors is an integer number (9808122241).

Almost surely, 2^19616244481 is an apocalyptic number.

It is an amenable number.

19616244481 is a deficient number, since it is larger than the sum of its proper divisors (1).

19616244481 is an equidigital number, since it uses as much as digits as its factorization.

19616244481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 331776, while the sum is 46.

The spelling of 19616244481 in words is "nineteen billion, six hundred sixteen million, two hundred forty-four thousand, four hundred eighty-one".