19361663938 has 4 divisors (see below), whose sum is σ = 29042495910. Its totient is φ = 9680831968.

The previous prime is 19361663933. The next prime is 19361663941. The reversal of 19361663938 is 83936616391.

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., 16395009849 + 2966654089 = 128043^2 + 54467^2 .

It is not an unprimeable number, because it can be changed into a prime (19361663933) 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, 4840415983 + ... + 4840415986.

Almost surely, 2^19361663938 is an apocalyptic number.

19361663938 is a deficient number, since it is larger than the sum of its proper divisors (9680831972).

19361663938 is an equidigital number, since it uses as much as digits as its factorization.

19361663938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9680831971.

The product of its digits is 3779136, while the sum is 55.

The spelling of 19361663938 in words is "nineteen billion, three hundred sixty-one million, six hundred sixty-three thousand, nine hundred thirty-eight".