19742022449 has 2 divisors, whose sum is σ = 19742022450. Its totient is φ = 19742022448.

The previous prime is 19742022427. The next prime is 19742022473. The reversal of 19742022449 is 94422024791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19542082849 + 199939600 = 139793^2 + 14140^2 .

It is a cyclic number.

It is not a de Polignac number, because 19742022449 - 2²⁴ = 19725245233 is a prime.

It is not a weakly prime, because it can be changed into another prime (19742022499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9871011224 + 9871011225.

It is an arithmetic number, because the mean of its divisors is an integer number (9871011225).

Almost surely, 2^19742022449 is an apocalyptic number.

It is an amenable number.

19742022449 is a deficient number, since it is larger than the sum of its proper divisors (1).

19742022449 is an equidigital number, since it uses as much as digits as its factorization.

19742022449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 19742022449 in words is "nineteen billion, seven hundred forty-two million, twenty-two thousand, four hundred forty-nine".