42878514235691 has 2 divisors, whose sum is σ = 42878514235692. Its totient is φ = 42878514235690.

The previous prime is 42878514235343. The next prime is 42878514235727. The reversal of 42878514235691 is 19653241587824.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42878514235691 is a prime.

It is not a weakly prime, because it can be changed into another prime (42878514235091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21439257117845 + 21439257117846.

It is an arithmetic number, because the mean of its divisors is an integer number (21439257117846).

Almost surely, 2^{42878514235691} is an apocalyptic number.

42878514235691 is a deficient number, since it is larger than the sum of its proper divisors (1).

42878514235691 is an equidigital number, since it uses as much as digits as its factorization.

42878514235691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116121600, while the sum is 65.

The spelling of 42878514235691 in words is "forty-two trillion, eight hundred seventy-eight billion, five hundred fourteen million, two hundred thirty-five thousand, six hundred ninety-one".