19713677749 has 2 divisors, whose sum is σ = 19713677750. Its totient is φ = 19713677748.

The previous prime is 19713677723. The next prime is 19713677771. The reversal of 19713677749 is 94777631791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18808751025 + 904926724 = 137145^2 + 30082^2 .

It is a cyclic number.

It is not a de Polignac number, because 19713677749 - 2⁹ = 19713677237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19713677719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9856838874 + 9856838875.

It is an arithmetic number, because the mean of its divisors is an integer number (9856838875).

Almost surely, 2^19713677749 is an apocalyptic number.

It is an amenable number.

19713677749 is a deficient number, since it is larger than the sum of its proper divisors (1).

19713677749 is an equidigital number, since it uses as much as digits as its factorization.

19713677749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14002632, while the sum is 61.

The spelling of 19713677749 in words is "nineteen billion, seven hundred thirteen million, six hundred seventy-seven thousand, seven hundred forty-nine".