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66240075281 = 4310382918041
BaseRepresentation
bin111101101100001101…
…110101011000010001
320022222101101110210112
4331230031311120101
52041124424402111
650232534411105
74533330231002
oct755415653021
9208871343715
1066240075281
1126101882a76
1210a07800a95
1363284a2123
1432c55171a9
151aca4ade8b
hexf6c375611

66240075281 has 16 divisors (see below), whose sum is σ = 68524959360. Its totient is φ = 63990622080.

The previous prime is 66240075197. The next prime is 66240075287. The reversal of 66240075281 is 18257004266.

It is a cyclic number.

It is not a de Polignac number, because 66240075281 - 230 = 65166333457 is a prime.

It is a super-2 number, since 2×662400752812 (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66240075287) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3662621 + ... + 3680661.

It is an arithmetic number, because the mean of its divisors is an integer number (4282809960).

Almost surely, 266240075281 is an apocalyptic number.

It is an amenable number.

66240075281 is a deficient number, since it is larger than the sum of its proper divisors (2284884079).

66240075281 is a wasteful number, since it uses less digits than its factorization.

66240075281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19016.

The product of its (nonzero) digits is 161280, while the sum is 41.

The spelling of 66240075281 in words is "sixty-six billion, two hundred forty million, seventy-five thousand, two hundred eighty-one".

Divisors: 1 43 103 829 4429 18041 35647 85387 775763 1858223 3671641 14955989 79903589 643107527 1540466867 66240075281