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61666673 = 296613217
BaseRepresentation
bin1110101100111…
…1010101110001
311022000222202212
43223033111301
5111241313143
610041421505
71346105135
oct353172561
9138028685
1061666673
113189a0a2
121879a895
13ca11773
1482933c5
155631918
hex3acf571

61666673 has 8 divisors (see below), whose sum is σ = 63909480. Its totient is φ = 59431680.

The previous prime is 61666651. The next prime is 61666681. The reversal of 61666673 is 37666616.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 31449664 + 30217009 = 5608^2 + 5497^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 61666673 - 28 = 61666417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 61666673.

It is not an unprimeable number, because it can be changed into a prime (61666573) 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, 17561 + ... + 20777.

It is an arithmetic number, because the mean of its divisors is an integer number (7988685).

Almost surely, 261666673 is an apocalyptic number.

It is an amenable number.

61666673 is a deficient number, since it is larger than the sum of its proper divisors (2242807).

61666673 is a wasteful number, since it uses less digits than its factorization.

61666673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3907.

The product of its digits is 163296, while the sum is 41.

The square root of 61666673 is about 7852.8130628457. The cubic root of 61666673 is about 395.0785999650.

The spelling of 61666673 in words is "sixty-one million, six hundred sixty-six thousand, six hundred seventy-three".

Divisors: 1 29 661 3217 19169 93293 2126437 61666673