19873778473 has 4 divisors (see below), whose sum is σ = 19896915280. Its totient is φ = 19850641668.

The previous prime is 19873778471. The next prime is 19873778489. The reversal of 19873778473 is 37487737891.

It is a happy number.

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 19873778473 - 2¹ = 19873778471 is a prime.

It is a super-3 number, since 3×19873778473³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19873778471) 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, 11567115 + ... + 11568832.

It is an arithmetic number, because the mean of its divisors is an integer number (4974228820).

Almost surely, 2^19873778473 is an apocalyptic number.

It is an amenable number.

19873778473 is a deficient number, since it is larger than the sum of its proper divisors (23136807).

19873778473 is an equidigital number, since it uses as much as digits as its factorization.

19873778473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23136806.

The product of its digits is 49787136, while the sum is 64.

The spelling of 19873778473 in words is "nineteen billion, eight hundred seventy-three million, seven hundred seventy-eight thousand, four hundred seventy-three".