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20663655539 is a prime number
BaseRepresentation
bin10011001111101001…
…100101110001110011
31222100002022110111112
4103033221211301303
5314304343434124
613254233503535
71331031113462
oct231751456163
958302273445
1020663655539
11884410527a
124008271bab
131c44030317
1410004bc9d9
1580e15e90e
hex4cfa65c73

20663655539 has 2 divisors, whose sum is σ = 20663655540. Its totient is φ = 20663655538.

The previous prime is 20663655497. The next prime is 20663655557. The reversal of 20663655539 is 93555636602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20663655539 - 220 = 20662606963 is a prime.

It is not a weakly prime, because it can be changed into another prime (20663655739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10331827769 + 10331827770.

It is an arithmetic number, because the mean of its divisors is an integer number (10331827770).

Almost surely, 220663655539 is an apocalyptic number.

20663655539 is a deficient number, since it is larger than the sum of its proper divisors (1).

20663655539 is an equidigital number, since it uses as much as digits as its factorization.

20663655539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374000, while the sum is 50.

The spelling of 20663655539 in words is "twenty billion, six hundred sixty-three million, six hundred fifty-five thousand, five hundred thirty-nine".