19612220549 has 2 divisors, whose sum is σ = 19612220550. Its totient is φ = 19612220548.

The previous prime is 19612220519. The next prime is 19612220569. The reversal of 19612220549 is 94502221691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14531097025 + 5081123524 = 120545^2 + 71282^2 .

It is a cyclic number.

It is not a de Polignac number, because 19612220549 - 2⁸ = 19612220293 is a prime.

It is a super-2 number, since 2×19612220549² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19612220519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9806110274 + 9806110275.

It is an arithmetic number, because the mean of its divisors is an integer number (9806110275).

Almost surely, 2^19612220549 is an apocalyptic number.

It is an amenable number.

19612220549 is a deficient number, since it is larger than the sum of its proper divisors (1).

19612220549 is an equidigital number, since it uses as much as digits as its factorization.

19612220549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 41.

The spelling of 19612220549 in words is "nineteen billion, six hundred twelve million, two hundred twenty thousand, five hundred forty-nine".