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19475857447 is a prime number
BaseRepresentation
bin10010001000110110…
…100000000000100111
31212021022021001211121
4102020312200000213
5304341304414242
612540323114411
71256426025334
oct221066400047
955238231747
1019475857447
118294682a62
123936512a07
131ab4c1ba07
14d2a84798b
1578ec34667
hex488da0027

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 2k-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, 219475857447 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".