42878516329393 has 2 divisors, whose sum is σ = 42878516329394. Its totient is φ = 42878516329392.

The previous prime is 42878516329391. The next prime is 42878516329427. The reversal of 42878516329393 is 39392361587824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34427239405729 + 8451276923664 = 5867473^2 + 2907108^2 .

It is a cyclic number.

It is not a de Polignac number, because 42878516329393 - 2¹ = 42878516329391 is a prime.

It is a super-2 number, since 2×42878516329393² (a number of 28 digits) contains 22 as substring.

Together with 42878516329391, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42878516329391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21439258164696 + 21439258164697.

It is an arithmetic number, because the mean of its divisors is an integer number (21439258164697).

Almost surely, 2^{42878516329393} is an apocalyptic number.

It is an amenable number.

42878516329393 is a deficient number, since it is larger than the sum of its proper divisors (1).

42878516329393 is an equidigital number, since it uses as much as digits as its factorization.

42878516329393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 470292480, while the sum is 70.

The spelling of 42878516329393 in words is "forty-two trillion, eight hundred seventy-eight billion, five hundred sixteen million, three hundred twenty-nine thousand, three hundred ninety-three".