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66899998 = 21117178877
BaseRepresentation
bin1111111100110…
…1000000011110
311122212212112201
43333031000132
5114111244443
610345522114
71441432504
oct377150036
9148785481
1066899998
1134843a60
121a4a333a
1310b247c9
148c56674
155d1734d
hex3fcd01e

66899998 has 16 divisors (see below), whose sum is σ = 115912944. Its totient is φ = 28620160.

The previous prime is 66899983. The next prime is 66899999. The reversal of 66899998 is 89999866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66899999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89065 + ... + 89812.

It is an arithmetic number, because the mean of its divisors is an integer number (7244559).

Almost surely, 266899998 is an apocalyptic number.

66899998 is a deficient number, since it is larger than the sum of its proper divisors (49012946).

66899998 is a wasteful number, since it uses less digits than its factorization.

66899998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178907.

The product of its digits is 15116544, while the sum is 64.

The square root of 66899998 is about 8179.2418964107. The cubic root of 66899998 is about 405.9526383152.

The spelling of 66899998 in words is "sixty-six million, eight hundred ninety-nine thousand, nine hundred ninety-eight".

Divisors: 1 2 11 17 22 34 187 374 178877 357754 1967647 3040909 3935294 6081818 33449999 66899998