19650681887 has 2 divisors, whose sum is σ = 19650681888. Its totient is φ = 19650681886.

The previous prime is 19650681881. The next prime is 19650681913. The reversal of 19650681887 is 78818605691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19650681887 - 2³⁴ = 2470812703 is a prime.

It is a super-2 number, since 2×19650681887² (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 (19650681881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9825340943 + 9825340944.

It is an arithmetic number, because the mean of its divisors is an integer number (9825340944).

Almost surely, 2^19650681887 is an apocalyptic number.

19650681887 is a deficient number, since it is larger than the sum of its proper divisors (1).

19650681887 is an equidigital number, since it uses as much as digits as its factorization.

19650681887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5806080, while the sum is 59.

The spelling of 19650681887 in words is "nineteen billion, six hundred fifty million, six hundred eighty-one thousand, eight hundred eighty-seven".