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66811913 = 7311512039
BaseRepresentation
bin1111111011011…
…1100000001001
311122201101201022
43332313200021
5114100440123
610344002225
71440614630
oct376674011
9148641638
1066811913
1134793863
121a460375
1310ac369c
148c32517
155ceb1c8
hex3fb7809

66811913 has 16 divisors (see below), whose sum is σ = 79380480. Its totient is φ = 55026000.

The previous prime is 66811909. The next prime is 66811937. The reversal of 66811913 is 31911866.

It is a cyclic number.

It is not a de Polignac number, because 66811913 - 22 = 66811909 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66811903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31748 + ... + 33786.

It is an arithmetic number, because the mean of its divisors is an integer number (4961280).

Almost surely, 266811913 is an apocalyptic number.

It is an amenable number.

66811913 is a deficient number, since it is larger than the sum of its proper divisors (12568567).

66811913 is a wasteful number, since it uses less digits than its factorization.

66811913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2228.

The product of its digits is 7776, while the sum is 35.

The square root of 66811913 is about 8173.8554550469. The cubic root of 66811913 is about 405.7743919543.

The spelling of 66811913 in words is "sixty-six million, eight hundred eleven thousand, nine hundred thirteen".

Divisors: 1 7 31 151 217 1057 2039 4681 14273 32767 63209 307889 442463 2155223 9544559 66811913