19966148953 has 2 divisors, whose sum is σ = 19966148954. Its totient is φ = 19966148952.

The previous prime is 19966148921. The next prime is 19966148971. The reversal of 19966148953 is 35984166991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13964857929 + 6001291024 = 118173^2 + 77468^2 .

It is a cyclic number.

It is not a de Polignac number, because 19966148953 - 2⁵ = 19966148921 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19966148891 and 19966148900.

It is not a weakly prime, because it can be changed into another prime (19966148053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9983074476 + 9983074477.

It is an arithmetic number, because the mean of its divisors is an integer number (9983074477).

Almost surely, 2^19966148953 is an apocalyptic number.

It is an amenable number.

19966148953 is a deficient number, since it is larger than the sum of its proper divisors (1).

19966148953 is an equidigital number, since it uses as much as digits as its factorization.

19966148953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12597120, while the sum is 61.

The spelling of 19966148953 in words is "nineteen billion, nine hundred sixty-six million, one hundred forty-eight thousand, nine hundred fifty-three".