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664043541 = 373645329
BaseRepresentation
bin100111100101001…
…000000000010101
31201021111220111020
4213211020000111
52324443343131
6145520431353
722312164000
oct4745100025
91637456436
10664043541
11310920817
12166478559
13a7760195
1464298537
153d46d996
hex27948015

664043541 has 16 divisors (see below), whose sum is σ = 1032528000. Its totient is φ = 379452864.

The previous prime is 664043533. The next prime is 664043543. The reversal of 664043541 is 145340466.

It is not a de Polignac number, because 664043541 - 23 = 664043533 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664043543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 321636 + ... + 323693.

It is an arithmetic number, because the mean of its divisors is an integer number (64533000).

Almost surely, 2664043541 is an apocalyptic number.

It is an amenable number.

664043541 is a deficient number, since it is larger than the sum of its proper divisors (368484459).

664043541 is an equidigital number, since it uses as much as digits as its factorization.

664043541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645353 (or 645339 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 664043541 is about 25769.0422988515. The cubic root of 664043541 is about 872.4332030428.

The spelling of 664043541 in words is "six hundred sixty-four million, forty-three thousand, five hundred forty-one".

Divisors: 1 3 7 21 49 147 343 1029 645329 1935987 4517303 13551909 31621121 94863363 221347847 664043541