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66551 = 611091
BaseRepresentation
bin10000001111110111
310101021212
4100033313
54112201
61232035
7365012
oct201767
9111255
1066551
1146001
123261b
13243a4
141a379
1514abb
hex103f7

66551 has 4 divisors (see below), whose sum is σ = 67704. Its totient is φ = 65400.

The previous prime is 66541. The next prime is 66553. The reversal of 66551 is 15566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-66551 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9 and base 15.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 485 + ... + 606.

It is an arithmetic number, because the mean of its divisors is an integer number (16926).

266551 is an apocalyptic number.

66551 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

66551 is a deficient number, since it is larger than the sum of its proper divisors (1153).

66551 is a wasteful number, since it uses less digits than its factorization.

66551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1152.

The product of its digits is 900, while the sum is 23.

The square root of 66551 is about 257.9748049713. The cubic root of 66551 is about 40.5245494610.

The spelling of 66551 in words is "sixty-six thousand, five hundred fifty-one".

Divisors: 1 61 1091 66551