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68551727528681 = 7918471180739791
BaseRepresentation
bin11111001011000111100010…
…10111100011101011101001
322222201110222202110100112122
433211203301113203223221
532441122414221404211
6401444121234121025
720303461466526005
oct1745436127435351
9288643882410478
1068551727528681
111a92a696060741
12783194aa20175
132c33528227847
1412cdcc8139705
157dd2c39d16db
hex3e58f15e3ae9

68551727528681 has 16 divisors (see below), whose sum is σ = 69464684298240. Its totient is φ = 67639909431120.

The previous prime is 68551727528677. The next prime is 68551727528689. The reversal of 68551727528681 is 18682572715586.

It is a cyclic number.

It is not a de Polignac number, because 68551727528681 - 22 = 68551727528677 is a prime.

It is a super-2 number, since 2×685517275286812 (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68551727528689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1722774896 + ... + 1722814686.

It is an arithmetic number, because the mean of its divisors is an integer number (4341542768640).

Almost surely, 268551727528681 is an apocalyptic number.

It is an amenable number.

68551727528681 is a deficient number, since it is larger than the sum of its proper divisors (912956769559).

68551727528681 is a wasteful number, since it uses less digits than its factorization.

68551727528681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53524.

The product of its digits is 451584000, while the sum is 71.

The spelling of 68551727528681 in words is "sixty-eight trillion, five hundred fifty-one billion, seven hundred twenty-seven million, five hundred twenty-eight thousand, six hundred eighty-one".

Divisors: 1 79 1847 11807 39791 145913 932753 3143489 21807529 73493977 469812337 1722794791 5806024183 37115174623 867743386439 68551727528681