19731632789873 has 2 divisors, whose sum is σ = 19731632789874. Its totient is φ = 19731632789872.

The previous prime is 19731632789849. The next prime is 19731632789989. The reversal of 19731632789873 is 37898723613791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13969294952704 + 5762337837169 = 3737552^2 + 2400487^2 .

It is a cyclic number.

It is not a de Polignac number, because 19731632789873 - 2⁶ = 19731632789809 is a prime.

It is a super-2 number, since 2×19731632789873² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19731632789873.

It is not a weakly prime, because it can be changed into another prime (19731632789173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9865816394936 + 9865816394937.

It is an arithmetic number, because the mean of its divisors is an integer number (9865816394937).

Almost surely, 2^{19731632789873} is an apocalyptic number.

It is an amenable number.

19731632789873 is a deficient number, since it is larger than the sum of its proper divisors (1).

19731632789873 is an equidigital number, since it uses as much as digits as its factorization.

19731632789873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576108288, while the sum is 74.

The spelling of 19731632789873 in words is "nineteen trillion, seven hundred thirty-one billion, six hundred thirty-two million, seven hundred eighty-nine thousand, eight hundred seventy-three".