19650986669 has 2 divisors, whose sum is σ = 19650986670. Its totient is φ = 19650986668.

The previous prime is 19650986659. The next prime is 19650986687. The reversal of 19650986669 is 96668905691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14015481769 + 5635504900 = 118387^2 + 75070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19650986669 is a prime.

It is a super-2 number, since 2×19650986669² (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 (19650986659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9825493334 + 9825493335.

It is an arithmetic number, because the mean of its divisors is an integer number (9825493335).

Almost surely, 2^19650986669 is an apocalyptic number.

It is an amenable number.

19650986669 is a deficient number, since it is larger than the sum of its proper divisors (1).

19650986669 is an equidigital number, since it uses as much as digits as its factorization.

19650986669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37791360, while the sum is 65.

The spelling of 19650986669 in words is "nineteen billion, six hundred fifty million, nine hundred eighty-six thousand, six hundred sixty-nine".