42878516505157 has 2 divisors, whose sum is σ = 42878516505158. Its totient is φ = 42878516505156.

The previous prime is 42878516505151. The next prime is 42878516505163. The reversal of 42878516505157 is 75150561587824.

It is a balanced prime because it is at equal distance from previous prime (42878516505151) and next prime (42878516505163).

It can be written as a sum of positive squares in only one way, i.e., 42870358622116 + 8157883041 = 6547546^2 + 90321^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42878516505157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42878516505151) 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, 21439258252578 + 21439258252579.

It is an arithmetic number, because the mean of its divisors is an integer number (21439258252579).

Almost surely, 2^{42878516505157} is an apocalyptic number.

It is an amenable number.

42878516505157 is a deficient number, since it is larger than the sum of its proper divisors (1).

42878516505157 is an equidigital number, since it uses as much as digits as its factorization.

42878516505157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 94080000, while the sum is 64.

The spelling of 42878516505157 in words is "forty-two trillion, eight hundred seventy-eight billion, five hundred sixteen million, five hundred five thousand, one hundred fifty-seven".