42457426691 has 2 divisors, whose sum is σ = 42457426692. Its totient is φ = 42457426690.

The previous prime is 42457426639. The next prime is 42457426717. The reversal of 42457426691 is 19662475424.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42457426691 is a prime.

It is not a weakly prime, because it can be changed into another prime (42457426621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21228713345 + 21228713346.

It is an arithmetic number, because the mean of its divisors is an integer number (21228713346).

Almost surely, 2^42457426691 is an apocalyptic number.

42457426691 is a deficient number, since it is larger than the sum of its proper divisors (1).

42457426691 is an equidigital number, since it uses as much as digits as its factorization.

42457426691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2903040, while the sum is 50.

The spelling of 42457426691 in words is "forty-two billion, four hundred fifty-seven million, four hundred twenty-six thousand, six hundred ninety-one".