42878275077871 has 2 divisors, whose sum is σ = 42878275077872. Its totient is φ = 42878275077870.

The previous prime is 42878275077761. The next prime is 42878275077877. The reversal of 42878275077871 is 17877057287824.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42878275077871 is a prime.

It is a super-2 number, since 2×42878275077871² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42878275077794 and 42878275077803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42878275077877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21439137538935 + 21439137538936.

It is an arithmetic number, because the mean of its divisors is an integer number (21439137538936).

Almost surely, 2^{42878275077871} is an apocalyptic number.

42878275077871 is a deficient number, since it is larger than the sum of its proper divisors (1).

42878275077871 is an equidigital number, since it uses as much as digits as its factorization.

42878275077871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 688414720, while the sum is 73.

The spelling of 42878275077871 in words is "forty-two trillion, eight hundred seventy-eight billion, two hundred seventy-five million, seventy-seven thousand, eight hundred seventy-one".