19781475359 has 4 divisors (see below), whose sum is σ = 20060087760. Its totient is φ = 19502862960.

The previous prime is 19781475313. The next prime is 19781475361. The reversal of 19781475359 is 95357418791.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19781475359 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19781475298 and 19781475307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19781474359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139306094 + ... + 139306235.

It is an arithmetic number, because the mean of its divisors is an integer number (5015021940).

Almost surely, 2^19781475359 is an apocalyptic number.

19781475359 is a deficient number, since it is larger than the sum of its proper divisors (278612401).

19781475359 is an equidigital number, since it uses as much as digits as its factorization.

19781475359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278612400.

The product of its digits is 9525600, while the sum is 59.

The spelling of 19781475359 in words is "nineteen billion, seven hundred eighty-one million, four hundred seventy-five thousand, three hundred fifty-nine".