19758474949 has 2 divisors, whose sum is σ = 19758474950. Its totient is φ = 19758474948.

The previous prime is 19758474947. The next prime is 19758474973. The reversal of 19758474949 is 94947485791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14338865025 + 5419609924 = 119745^2 + 73618^2 .

It is a cyclic number.

It is not a de Polignac number, because 19758474949 - 2¹ = 19758474947 is a prime.

Together with 19758474947, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19758474947) 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, 9879237474 + 9879237475.

It is an arithmetic number, because the mean of its divisors is an integer number (9879237475).

Almost surely, 2^19758474949 is an apocalyptic number.

It is an amenable number.

19758474949 is a deficient number, since it is larger than the sum of its proper divisors (1).

19758474949 is an equidigital number, since it uses as much as digits as its factorization.

19758474949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 91445760, while the sum is 67.

The spelling of 19758474949 in words is "nineteen billion, seven hundred fifty-eight million, four hundred seventy-four thousand, nine hundred forty-nine".