19763967109 has 2 divisors, whose sum is σ = 19763967110. Its totient is φ = 19763967108.

The previous prime is 19763967079. The next prime is 19763967127. The reversal of 19763967109 is 90176936791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18915876225 + 848090884 = 137535^2 + 29122^2 .

It is a cyclic number.

It is not a de Polignac number, because 19763967109 - 2⁵ = 19763967077 is a prime.

It is a super-2 number, since 2×19763967109² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19763964109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9881983554 + 9881983555.

It is an arithmetic number, because the mean of its divisors is an integer number (9881983555).

Almost surely, 2^19763967109 is an apocalyptic number.

It is an amenable number.

19763967109 is a deficient number, since it is larger than the sum of its proper divisors (1).

19763967109 is an equidigital number, since it uses as much as digits as its factorization.

19763967109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3857868, while the sum is 58.

The spelling of 19763967109 in words is "nineteen billion, seven hundred sixty-three million, nine hundred sixty-seven thousand, one hundred nine".