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66986 = 233493
BaseRepresentation
bin10000010110101010
310101212222
4100112222
54120421
61234042
7366203
oct202652
9111788
1066986
1146367
1232922
132464a
141a5aa
1514cab
hex105aa

66986 has 4 divisors (see below), whose sum is σ = 100482. Its totient is φ = 33492.

The previous prime is 66977. The next prime is 67003. The reversal of 66986 is 68966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68966 = 234483.

It can be written as a sum of positive squares in only one way, i.e., 34225 + 32761 = 185^2 + 181^2 .

It is an Ulam number.

It is a plaindrome in base 9.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16745 + ... + 16748.

266986 is an apocalyptic number.

66986 is a deficient number, since it is larger than the sum of its proper divisors (33496).

66986 is a wasteful number, since it uses less digits than its factorization.

66986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33495.

The product of its digits is 15552, while the sum is 35.

The square root of 66986 is about 258.8165373387. The cubic root of 66986 is about 40.6126518684.

The spelling of 66986 in words is "sixty-six thousand, nine hundred eighty-six".

Divisors: 1 2 33493 66986