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71778000001 = 111736424237
BaseRepresentation
bin100001011011001001…
…1010101110010000001
320212021022222012100111
41002312103111302001
52134000132000001
652550243351321
75120503635061
oct1026623256201
9225238865314
1071778000001
112849389a864
1211ab2382541
1369cb903b66
14368cc033a1
151d01770851
hex10b64d5c81

71778000001 has 4 divisors (see below), whose sum is σ = 71784435412. Its totient is φ = 71771564592.

The previous prime is 71777999939. The next prime is 71778000013. The reversal of 71778000001 is 10000087717.

It is the 109376-th star number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 36604872976 + 35173127025 = 191324^2 + 187545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-71778000001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71778000401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3200946 + ... + 3223291.

It is an arithmetic number, because the mean of its divisors is an integer number (17946108853).

Almost surely, 271778000001 is an apocalyptic number.

It is an amenable number.

71778000001 is a deficient number, since it is larger than the sum of its proper divisors (6435411).

71778000001 is a wasteful number, since it uses less digits than its factorization.

71778000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6435410.

The product of its (nonzero) digits is 2744, while the sum is 31.

Adding to 71778000001 its reverse (10000087717), we get a palindrome (81778087718).

The spelling of 71778000001 in words is "seventy-one billion, seven hundred seventy-eight million, one", and thus it is an aban number.

Divisors: 1 11173 6424237 71778000001