19478386257 has 32 divisors (see below), whose sum is σ = 29969104896. Its totient is φ = 11137104000.

The previous prime is 19478386253. The next prime is 19478386267. The reversal of 19478386257 is 75268387491.

It is not a de Polignac number, because 19478386257 - 2² = 19478386253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19478386257.

It is not an unprimeable number, because it can be changed into a prime (19478386253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 120369 + ... + 231182.

It is an arithmetic number, because the mean of its divisors is an integer number (936534528).

Almost surely, 2^19478386257 is an apocalyptic number.

It is an amenable number.

19478386257 is a deficient number, since it is larger than the sum of its proper divisors (10490718639).

19478386257 is a wasteful number, since it uses less digits than its factorization.

19478386257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351661.

The product of its digits is 20321280, while the sum is 60.

The spelling of 19478386257 in words is "nineteen billion, four hundred seventy-eight million, three hundred eighty-six thousand, two hundred fifty-seven".