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66099997 is a prime number
BaseRepresentation
bin1111110000100…
…1101100011101
311121101020011001
43330021230131
5113410144442
610320430301
71431561235
oct374115435
9147336131
1066099997
11343479a7
121a178391
1310904632
148ac8cc5
155c0a2b7
hex3f09b1d

66099997 has 2 divisors, whose sum is σ = 66099998. Its totient is φ = 66099996.

The previous prime is 66099977. The next prime is 66100007. The reversal of 66099997 is 79999066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66031876 + 68121 = 8126^2 + 261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-66099997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66099977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33049998 + 33049999.

It is an arithmetic number, because the mean of its divisors is an integer number (33049999).

Almost surely, 266099997 is an apocalyptic number.

It is an amenable number.

66099997 is a deficient number, since it is larger than the sum of its proper divisors (1).

66099997 is an equidigital number, since it uses as much as digits as its factorization.

66099997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1653372, while the sum is 55.

The square root of 66099997 is about 8130.1904651736. The cubic root of 66099997 is about 404.3279959810.

The spelling of 66099997 in words is "sixty-six million, ninety-nine thousand, nine hundred ninety-seven".