19739345771 has 2 divisors, whose sum is σ = 19739345772. Its totient is φ = 19739345770.

The previous prime is 19739345723. The next prime is 19739345809. The reversal of 19739345771 is 17754393791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19739345771 - 2⁶ = 19739345707 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (19739345971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9869672885 + 9869672886.

It is an arithmetic number, because the mean of its divisors is an integer number (9869672886).

Almost surely, 2^19739345771 is an apocalyptic number.

19739345771 is a deficient number, since it is larger than the sum of its proper divisors (1).

19739345771 is an equidigital number, since it uses as much as digits as its factorization.

19739345771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5000940, while the sum is 56.

The spelling of 19739345771 in words is "nineteen billion, seven hundred thirty-nine million, three hundred forty-five thousand, seven hundred seventy-one".