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66011985 = 32513195939
BaseRepresentation
bin1111101111010…
…0001101010001
311121012202102100
43323310031101
5113344340420
610314511013
71431043524
oct373641521
9147182370
1066011985
1134297866
121a135469
13108a3560
148aa4bbb
155bde190
hex3ef4351

66011985 has 48 divisors (see below), whose sum is σ = 129729600. Its totient is φ = 30782592.

The previous prime is 66011941. The next prime is 66012031. The reversal of 66011985 is 58911066.

It is not a de Polignac number, because 66011985 - 213 = 66003793 is a prime.

Together with 63717615 it forms an amicable pair .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8146 + ... + 14084.

It is an arithmetic number, because the mean of its divisors is an integer number (2702700).

Almost surely, 266011985 is an apocalyptic number.

66011985 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66011985 is a deficient number, since it is larger than the sum of its proper divisors (63717615).

66011985 is a wasteful number, since it uses less digits than its factorization.

66011985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5982 (or 5979 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 66011985 is about 8124.7759969122. The cubic root of 66011985 is about 404.1484623300.

The spelling of 66011985 in words is "sixty-six million, eleven thousand, nine hundred eighty-five".

Divisors: 1 3 5 9 13 15 19 39 45 57 65 95 117 171 195 247 285 585 741 855 1235 2223 3705 5939 11115 17817 29695 53451 77207 89085 112841 231621 267255 338523 386035 564205 694863 1015569 1158105 1466933 1692615 3474315 4400799 5077845 7334665 13202397 22003995 66011985