19838825066 has 4 divisors (see below), whose sum is σ = 29758237602. Its totient is φ = 9919412532.

The previous prime is 19838825063. The next prime is 19838825077. The reversal of 19838825066 is 66052883891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18315562225 + 1523262841 = 135335^2 + 39029^2 .

It is not an unprimeable number, because it can be changed into a prime (19838825063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4959706265 + ... + 4959706268.

Almost surely, 2^19838825066 is an apocalyptic number.

19838825066 is a deficient number, since it is larger than the sum of its proper divisors (9919412536).

19838825066 is an equidigital number, since it uses as much as digits as its factorization.

19838825066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9919412535.

The product of its (nonzero) digits is 4976640, while the sum is 56.

The spelling of 19838825066 in words is "nineteen billion, eight hundred thirty-eight million, eight hundred twenty-five thousand, sixty-six".