19654689953 has 2 divisors, whose sum is σ = 19654689954. Its totient is φ = 19654689952.

The previous prime is 19654689947. The next prime is 19654690007. The reversal of 19654689953 is 35998645691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18940090129 + 714599824 = 137623^2 + 26732^2 .

It is an emirp because it is prime and its reverse (35998645691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19654689953 - 2⁶ = 19654689889 is a prime.

It is a super-3 number, since 3×19654689953³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19654689953.

It is not a weakly prime, because it can be changed into another prime (19654589953) 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, 9827344976 + 9827344977.

It is an arithmetic number, because the mean of its divisors is an integer number (9827344977).

Almost surely, 2^19654689953 is an apocalyptic number.

It is an amenable number.

19654689953 is a deficient number, since it is larger than the sum of its proper divisors (1).

19654689953 is an equidigital number, since it uses as much as digits as its factorization.

19654689953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62985600, while the sum is 65.

The spelling of 19654689953 in words is "nineteen billion, six hundred fifty-four million, six hundred eighty-nine thousand, nine hundred fifty-three".