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666550903 = 2497126693
BaseRepresentation
bin100111101110101…
…100001001110111
31201110020021221111
4213232230021313
52331114112103
6150050255451
722342406044
oct4756541167
91643207844
10666550903
11312283617
12167287587
13a812a525
146474c1cb
153d7b686d
hex27bac277

666550903 has 4 divisors (see below), whose sum is σ = 666602568. Its totient is φ = 666499240.

The previous prime is 666550897. The next prime is 666550939. The reversal of 666550903 is 309055666.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 309055666 = 2154527833.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-666550903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666550303) 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, 11625 + ... + 38317.

It is an arithmetic number, because the mean of its divisors is an integer number (166650642).

Almost surely, 2666550903 is an apocalyptic number.

666550903 is a deficient number, since it is larger than the sum of its proper divisors (51665).

666550903 is a wasteful number, since it uses less digits than its factorization.

666550903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51664.

The product of its (nonzero) digits is 145800, while the sum is 40.

The square root of 666550903 is about 25817.6471236246. The cubic root of 666550903 is about 873.5298973704.

The spelling of 666550903 in words is "six hundred sixty-six million, five hundred fifty thousand, nine hundred three".

Divisors: 1 24971 26693 666550903