19754949749 has 2 divisors, whose sum is σ = 19754949750. Its totient is φ = 19754949748.

The previous prime is 19754949719. The next prime is 19754949751. The reversal of 19754949749 is 94794945791.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18931833649 + 823116100 = 137593^2 + 28690^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19754949749 is a prime.

Together with 19754949751, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19754949719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9877474874 + 9877474875.

It is an arithmetic number, because the mean of its divisors is an integer number (9877474875).

Almost surely, 2^19754949749 is an apocalyptic number.

It is an amenable number.

19754949749 is a deficient number, since it is larger than the sum of its proper divisors (1).

19754949749 is an equidigital number, since it uses as much as digits as its factorization.

19754949749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 102876480, while the sum is 68.

The spelling of 19754949749 in words is "nineteen billion, seven hundred fifty-four million, nine hundred forty-nine thousand, seven hundred forty-nine".