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64531359385 = 512906271877
BaseRepresentation
bin111100000110010111…
…100110011010011001
320011120022010201020121
4330012113212122121
52024130012000020
645351214553241
74443101335003
oct740627463231
9204508121217
1064531359385
11254052a7479
121060b508821
13611549362c
1431a2603373
151a2a487baa
hexf065e6699

64531359385 has 4 divisors (see below), whose sum is σ = 77437631268. Its totient is φ = 51625087504.

The previous prime is 64531359379. The next prime is 64531359391. The reversal of 64531359385 is 58395313546.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (64531359379) and next prime (64531359391).

It can be written as a sum of positive squares in 2 ways, for example, as 8130809241 + 56400550144 = 90171^2 + 237488^2 .

It is a cyclic number.

It is not a de Polignac number, because 64531359385 - 25 = 64531359353 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6453135934 + ... + 6453135943.

It is an arithmetic number, because the mean of its divisors is an integer number (19359407817).

Almost surely, 264531359385 is an apocalyptic number.

It is an amenable number.

64531359385 is a deficient number, since it is larger than the sum of its proper divisors (12906271883).

64531359385 is a wasteful number, since it uses less digits than its factorization.

64531359385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12906271882.

The product of its digits is 5832000, while the sum is 52.

The spelling of 64531359385 in words is "sixty-four billion, five hundred thirty-one million, three hundred fifty-nine thousand, three hundred eighty-five".

Divisors: 1 5 12906271877 64531359385