19475857447 has 2 divisors, whose sum is σ = 19475857448. Its totient is φ = 19475857446.

The previous prime is 19475857409. The next prime is 19475857459. The reversal of 19475857447 is 74475857491.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19475857447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19475857487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9737928723 + 9737928724.

It is an arithmetic number, because the mean of its divisors is an integer number (9737928724).

Almost surely, 2^19475857447 is an apocalyptic number.

19475857447 is a deficient number, since it is larger than the sum of its proper divisors (1).

19475857447 is an equidigital number, since it uses as much as digits as its factorization.

19475857447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39513600, while the sum is 61.

The spelling of 19475857447 in words is "nineteen billion, four hundred seventy-five million, eight hundred fifty-seven thousand, four hundred forty-seven".