42865544740861 has 2 divisors, whose sum is σ = 42865544740862. Its totient is φ = 42865544740860.

The previous prime is 42865544740819. The next prime is 42865544740867. The reversal of 42865544740861 is 16804744556824.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39923050503961 + 2942494236900 = 6318469^2 + 1715370^2 .

It is a cyclic number.

It is not a de Polignac number, because 42865544740861 - 2¹¹ = 42865544738813 is a prime.

It is a super-2 number, since 2×42865544740861² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42865544740793 and 42865544740802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42865544740867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21432772370430 + 21432772370431.

It is an arithmetic number, because the mean of its divisors is an integer number (21432772370431).

Almost surely, 2^{42865544740861} is an apocalyptic number.

It is an amenable number.

42865544740861 is a deficient number, since it is larger than the sum of its proper divisors (1).

42865544740861 is an equidigital number, since it uses as much as digits as its factorization.

42865544740861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 206438400, while the sum is 64.

The spelling of 42865544740861 in words is "forty-two trillion, eight hundred sixty-five billion, five hundred forty-four million, seven hundred forty thousand, eight hundred sixty-one".