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661666166 = 2747261869
BaseRepresentation
bin100111011100000…
…011100101110110
31201010001010100022
4213130003211312
52323341304131
6145353445142
722253032610
oct4734034566
91633033308
10661666166
1130a547647
121657107b2
13a710a055
1463c39db0
153d14e37b
hex27703976

661666166 has 8 divisors (see below), whose sum is σ = 1134284880. Its totient is φ = 283571208.

The previous prime is 661666133. The next prime is 661666219.

661666166 is nontrivially palindromic in base 10.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23630921 + ... + 23630948.

It is an arithmetic number, because the mean of its divisors is an integer number (141785610).

Almost surely, 2661666166 is an apocalyptic number.

661666166 is a deficient number, since it is larger than the sum of its proper divisors (472618714).

661666166 is a wasteful number, since it uses less digits than its factorization.

661666166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47261878.

The product of its digits is 279936, while the sum is 44.

The square root of 661666166 is about 25722.8724290271. The cubic root of 661666166 is about 871.3908110460.

The spelling of 661666166 in words is "six hundred sixty-one million, six hundred sixty-six thousand, one hundred sixty-six".

Divisors: 1 2 7 14 47261869 94523738 330833083 661666166