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68236663287 = 3136726114299
BaseRepresentation
bin111111100011001110…
…001101100111110111
320112010112022122122110
4333203032031213313
52104222041211122
651203020302103
74633653032202
oct774316154767
9215115278573
1068236663287
1126a368aa101
12112843a1933
136586023450
143434764939
151b958ea90c
hexfe338d9f7

68236663287 has 16 divisors (see below), whose sum is σ = 99443254400. Its totient is φ = 41365048032.

The previous prime is 68236663283. The next prime is 68236663303. The reversal of 68236663287 is 78236663286.

It is not a de Polignac number, because 68236663287 - 22 = 68236663283 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 (68236663283) 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, 13054537 + ... + 13059762.

It is an arithmetic number, because the mean of its divisors is an integer number (6215203400).

Almost surely, 268236663287 is an apocalyptic number.

68236663287 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

68236663287 is a deficient number, since it is larger than the sum of its proper divisors (31206591113).

68236663287 is a wasteful number, since it uses less digits than its factorization.

68236663287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26114382.

The product of its digits is 20901888, while the sum is 57.

Subtracting 68236663287 from its reverse (78236663286), we obtain a palindrome (9999999999).

The spelling of 68236663287 in words is "sixty-eight billion, two hundred thirty-six million, six hundred sixty-three thousand, two hundred eighty-seven".

Divisors: 1 3 13 39 67 201 871 2613 26114299 78342897 339485887 1018457661 1749658033 5248974099 22745554429 68236663287