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666666670 = 2566666667
BaseRepresentation
bin100111101111001…
…000011010101110
31201110110011202011
4213233020122232
52331131313140
6150052551434
722343400415
oct4757103256
91643404664
10666666670
1131235259a
1216732257a
13a816b127
146477c47c
153d7dacea
hex27bc86ae

666666670 has 8 divisors (see below), whose sum is σ = 1200000024. Its totient is φ = 266666664.

The previous prime is 666666667. The next prime is 666666691. The reversal of 666666670 is 76666666.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33333324 + ... + 33333343.

It is an arithmetic number, because the mean of its divisors is an integer number (150000003).

Almost surely, 2666666670 is an apocalyptic number.

666666670 is a deficient number, since it is larger than the sum of its proper divisors (533333354).

666666670 is a wasteful number, since it uses less digits than its factorization.

666666670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66666674.

The product of its (nonzero) digits is 1959552, while the sum is 49.

The square root of 666666670 is about 25819.8890392658. The cubic root of 666666670 is about 873.5804661923.

The spelling of 666666670 in words is "six hundred sixty-six million, six hundred sixty-six thousand, six hundred seventy".

Divisors: 1 2 5 10 66666667 133333334 333333335 666666670