19172825549 has 2 divisors, whose sum is σ = 19172825550. Its totient is φ = 19172825548.

The previous prime is 19172825491. The next prime is 19172825579. The reversal of 19172825549 is 94552827191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18553164100 + 619661449 = 136210^2 + 24893^2 .

It is a cyclic number.

It is not a de Polignac number, because 19172825549 - 2⁸ = 19172825293 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19172825549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19172825579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9586412774 + 9586412775.

It is an arithmetic number, because the mean of its divisors is an integer number (9586412775).

Almost surely, 2^19172825549 is an apocalyptic number.

It is an amenable number.

19172825549 is a deficient number, since it is larger than the sum of its proper divisors (1).

19172825549 is an equidigital number, since it uses as much as digits as its factorization.

19172825549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1814400, while the sum is 53.

The spelling of 19172825549 in words is "nineteen billion, one hundred seventy-two million, eight hundred twenty-five thousand, five hundred forty-nine".