19754474849 has 2 divisors, whose sum is σ = 19754474850. Its totient is φ = 19754474848.

The previous prime is 19754474833. The next prime is 19754474863. The reversal of 19754474849 is 94847445791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18753385249 + 1001089600 = 136943^2 + 31640^2 .

It is a cyclic number.

It is not a de Polignac number, because 19754474849 - 2⁴ = 19754474833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19754474791 and 19754474800.

It is not a weakly prime, because it can be changed into another prime (19754474879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9877237424 + 9877237425.

It is an arithmetic number, because the mean of its divisors is an integer number (9877237425).

Almost surely, 2^19754474849 is an apocalyptic number.

It is an amenable number.

19754474849 is a deficient number, since it is larger than the sum of its proper divisors (1).

19754474849 is an equidigital number, since it uses as much as digits as its factorization.

19754474849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40642560, while the sum is 62.

The spelling of 19754474849 in words is "nineteen billion, seven hundred fifty-four million, four hundred seventy-four thousand, eight hundred forty-nine".