19737803681 has 2 divisors, whose sum is σ = 19737803682. Its totient is φ = 19737803680.

The previous prime is 19737803663. The next prime is 19737803689. The reversal of 19737803681 is 18630873791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19706544400 + 31259281 = 140380^2 + 5591^2 .

It is an emirp because it is prime and its reverse (18630873791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19737803681 - 2¹⁰ = 19737802657 is a prime.

It is a super-2 number, since 2×19737803681² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19737803689) 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, 9868901840 + 9868901841.

It is an arithmetic number, because the mean of its divisors is an integer number (9868901841).

Almost surely, 2^19737803681 is an apocalyptic number.

It is an amenable number.

19737803681 is a deficient number, since it is larger than the sum of its proper divisors (1).

19737803681 is an equidigital number, since it uses as much as digits as its factorization.

19737803681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1524096, while the sum is 53.

The spelling of 19737803681 in words is "nineteen billion, seven hundred thirty-seven million, eight hundred three thousand, six hundred eighty-one".