19848963994 has 4 divisors (see below), whose sum is σ = 29773445994. Its totient is φ = 9924481996.

The previous prime is 19848963977. The next prime is 19848963997. The reversal of 19848963994 is 49936984891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49936984891 = 283 ⋅176455777.

It can be written as a sum of positive squares in only one way, i.e., 19842384769 + 6579225 = 140863^2 + 2565^2 .

It is not an unprimeable number, because it can be changed into a prime (19848963997) 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, 4962240997 + ... + 4962241000.

Almost surely, 2^19848963994 is an apocalyptic number.

19848963994 is a deficient number, since it is larger than the sum of its proper divisors (9924482000).

19848963994 is an equidigital number, since it uses as much as digits as its factorization.

19848963994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9924481999.

The product of its digits is 120932352, while the sum is 70.

The spelling of 19848963994 in words is "nineteen billion, eight hundred forty-eight million, nine hundred sixty-three thousand, nine hundred ninety-four".