19478442253 has 4 divisors (see below), whose sum is σ = 19500502528. Its totient is φ = 19456381980.

The previous prime is 19478442199. The next prime is 19478442259. The reversal of 19478442253 is 35224487491.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19478442253 - 2¹³ = 19478434061 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19478442197 and 19478442206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19478442259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11028813 + ... + 11030578.

It is an arithmetic number, because the mean of its divisors is an integer number (4875125632).

Almost surely, 2^19478442253 is an apocalyptic number.

It is an amenable number.

19478442253 is a deficient number, since it is larger than the sum of its proper divisors (22060275).

19478442253 is an equidigital number, since it uses as much as digits as its factorization.

19478442253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22060274.

The product of its digits is 1935360, while the sum is 49.

The spelling of 19478442253 in words is "nineteen billion, four hundred seventy-eight million, four hundred forty-two thousand, two hundred fifty-three".