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205687131359 is a prime number
BaseRepresentation
bin1011111110001111101…
…0001000110011011111
3201122220200121220002012
42333203322020303133
511332221401200414
6234254045021435
720601055524623
oct2774372106337
9648820556065
10205687131359
117a260029166
1233a4425487b
131651c632968
149d5352b183
15553c8aa33e
hex2fe3e88cdf

205687131359 has 2 divisors, whose sum is σ = 205687131360. Its totient is φ = 205687131358.

The previous prime is 205687131317. The next prime is 205687131389. The reversal of 205687131359 is 953131786502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-205687131359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205687131389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102843565679 + 102843565680.

It is an arithmetic number, because the mean of its divisors is an integer number (102843565680).

Almost surely, 2205687131359 is an apocalyptic number.

205687131359 is a deficient number, since it is larger than the sum of its proper divisors (1).

205687131359 is an equidigital number, since it uses as much as digits as its factorization.

205687131359 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1360800, while the sum is 50.

The spelling of 205687131359 in words is "two hundred five billion, six hundred eighty-seven million, one hundred thirty-one thousand, three hundred fifty-nine".