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66888899 = 71123179211
BaseRepresentation
bin1111111100101…
…0010011000011
311122212022022122
43333022103003
5114110421044
610345354455
71441355240
oct377122303
9148768278
1066888899
1134836690
121a498a2b
1310b1c73c
148c525c7
155d13dee
hex3fca4c3

66888899 has 32 divisors (see below), whose sum is σ = 87920640. Its totient is φ = 49341600.

The previous prime is 66888889. The next prime is 66888907. The reversal of 66888899 is 99888866.

It is a happy number.

It is not a de Polignac number, because 66888899 - 24 = 66888883 is a prime.

66888899 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (66888869) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 316904 + ... + 317114.

It is an arithmetic number, because the mean of its divisors is an integer number (2747520).

Almost surely, 266888899 is an apocalyptic number.

66888899 is a deficient number, since it is larger than the sum of its proper divisors (21031741).

66888899 is a wasteful number, since it uses less digits than its factorization.

66888899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431.

The product of its digits is 11943936, while the sum is 62.

The square root of 66888899 is about 8178.5633824040. The cubic root of 66888899 is about 405.9301873054.

The spelling of 66888899 in words is "sixty-six million, eight hundred eighty-eight thousand, eight hundred ninety-nine".

Divisors: 1 7 11 23 77 161 179 211 253 1253 1477 1771 1969 2321 4117 4853 13783 16247 28819 33971 37769 45287 53383 264383 317009 373681 415459 868687 2908213 6080809 9555557 66888899