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66666533 = 411626013
BaseRepresentation
bin1111111001010…
…0000000100101
311122110000021212
43332110000211
5114031312113
610340521205
71436441033
oct376240045
9148400255
1066666533
11346a460a
121a3b0205
1310a7246b
148bd5553
155cbd0a8
hex3f94025

66666533 has 4 divisors (see below), whose sum is σ = 68292588. Its totient is φ = 65040480.

The previous prime is 66666517. The next prime is 66666557. The reversal of 66666533 is 33566666.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2137444 + 64529089 = 1462^2 + 8033^2 .

It is a cyclic number.

It is not a de Polignac number, because 66666533 - 24 = 66666517 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 1626013 = 66666533 / (6 + 6 + 6 + 6 + 6 + 5 + 3 + 3).

It is a Duffinian number.

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 (66666133) 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, 812966 + ... + 813047.

It is an arithmetic number, because the mean of its divisors is an integer number (17073147).

Almost surely, 266666533 is an apocalyptic number.

It is an amenable number.

66666533 is a deficient number, since it is larger than the sum of its proper divisors (1626055).

66666533 is a wasteful number, since it uses less digits than its factorization.

66666533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1626054.

The product of its digits is 349920, while the sum is 41.

The square root of 66666533 is about 8164.9576238949. The cubic root of 66666533 is about 405.4798620422.

The spelling of 66666533 in words is "sixty-six million, six hundred sixty-six thousand, five hundred thirty-three".

Divisors: 1 41 1626013 66666533