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66613221 = 32192316937
BaseRepresentation
bin1111111000011…
…0111111100101
311122100022011100
43332012333211
5114023110341
610335430313
71436126433
oct376067745
9148308140
1066613221
1134668554
121a385399
1310a5410c
148bbdd53
155cac3b6
hex3f86fe5

66613221 has 24 divisors (see below), whose sum is σ = 105693120. Its totient is φ = 40239936.

The previous prime is 66613219. The next prime is 66613223. The reversal of 66613221 is 12231666.

It is an interprime number because it is at equal distance from previous prime (66613219) and next prime (66613223).

It is not a de Polignac number, because 66613221 - 21 = 66613219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66613223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4536 + ... + 12401.

It is an arithmetic number, because the mean of its divisors is an integer number (4403880).

Almost surely, 266613221 is an apocalyptic number.

It is an amenable number.

66613221 is a deficient number, since it is larger than the sum of its proper divisors (39079899).

66613221 is a wasteful number, since it uses less digits than its factorization.

66613221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16985 (or 16982 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 66613221 is about 8161.6922877550. The cubic root of 66613221 is about 405.3717482894.

Adding to 66613221 its reverse (12231666), we get a palindrome (78844887).

The spelling of 66613221 in words is "sixty-six million, six hundred thirteen thousand, two hundred twenty-one".

Divisors: 1 3 9 19 23 57 69 171 207 437 1311 3933 16937 50811 152433 321803 389551 965409 1168653 2896227 3505959 7401469 22204407 66613221