19737042641 has 2 divisors, whose sum is σ = 19737042642. Its totient is φ = 19737042640.

The previous prime is 19737042617. The next prime is 19737042659. The reversal of 19737042641 is 14624073791.

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., 19689983041 + 47059600 = 140321^2 + 6860^2 .

It is an emirp because it is prime and its reverse (14624073791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19737042641 - 2¹⁰ = 19737041617 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 19737042592 and 19737042601.

It is not a weakly prime, because it can be changed into another prime (19737041641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9868521320 + 9868521321.

It is an arithmetic number, because the mean of its divisors is an integer number (9868521321).

Almost surely, 2^19737042641 is an apocalyptic number.

It is an amenable number.

19737042641 is a deficient number, since it is larger than the sum of its proper divisors (1).

19737042641 is an equidigital number, since it uses as much as digits as its factorization.

19737042641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 44.

The spelling of 19737042641 in words is "nineteen billion, seven hundred thirty-seven million, forty-two thousand, six hundred forty-one".