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261660611 is a prime number
BaseRepresentation
bin11111001100010…
…01111111000011
3200020100201212202
433212021333003
51013441114421
641544143415
76325035632
oct1746117703
9606321782
10261660611
11124778543
1273767b6b
1342296084
1426a73519
1517e8910b
hexf989fc3

261660611 has 2 divisors, whose sum is σ = 261660612. Its totient is φ = 261660610.

The previous prime is 261660557. The next prime is 261660643. The reversal of 261660611 is 116066162.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-261660611 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261660911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130830305 + 130830306.

It is an arithmetic number, because the mean of its divisors is an integer number (130830306).

Almost surely, 2261660611 is an apocalyptic number.

261660611 is a deficient number, since it is larger than the sum of its proper divisors (1).

261660611 is an equidigital number, since it uses as much as digits as its factorization.

261660611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 261660611 is about 16175.9268977082. The cubic root of 261660611 is about 639.6063749796.

The spelling of 261660611 in words is "two hundred sixty-one million, six hundred sixty thousand, six hundred eleven".