42878518036181 has 2 divisors, whose sum is σ = 42878518036182. Its totient is φ = 42878518036180.

The previous prime is 42878518036121. The next prime is 42878518036247. The reversal of 42878518036181 is 18163081587824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35283897000625 + 7594621035556 = 5940025^2 + 2755834^2 .

It is a cyclic number.

It is not a de Polignac number, because 42878518036181 - 2¹⁴ = 42878518019797 is a prime.

It is a super-2 number, since 2×42878518036181² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42878518036121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21439259018090 + 21439259018091.

It is an arithmetic number, because the mean of its divisors is an integer number (21439259018091).

Almost surely, 2^{42878518036181} is an apocalyptic number.

It is an amenable number.

42878518036181 is a deficient number, since it is larger than the sum of its proper divisors (1).

42878518036181 is an equidigital number, since it uses as much as digits as its factorization.

42878518036181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20643840, while the sum is 62.

The spelling of 42878518036181 in words is "forty-two trillion, eight hundred seventy-eight billion, five hundred eighteen million, thirty-six thousand, one hundred eighty-one".