42457737691 has 2 divisors, whose sum is σ = 42457737692. Its totient is φ = 42457737690.

The previous prime is 42457737689. The next prime is 42457737713. The reversal of 42457737691 is 19673775424.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42457737691 - 2¹ = 42457737689 is a prime.

It is a super-2 number, since 2×42457737691² (a number of 22 digits) contains 22 as substring.

Together with 42457737689, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42457737631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21228868845 + 21228868846.

It is an arithmetic number, because the mean of its divisors is an integer number (21228868846).

Almost surely, 2^42457737691 is an apocalyptic number.

42457737691 is a deficient number, since it is larger than the sum of its proper divisors (1).

42457737691 is an equidigital number, since it uses as much as digits as its factorization.

42457737691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8890560, while the sum is 55.

The spelling of 42457737691 in words is "forty-two billion, four hundred fifty-seven million, seven hundred thirty-seven thousand, six hundred ninety-one".