42771660643 has 2 divisors, whose sum is σ = 42771660644. Its totient is φ = 42771660642.

The previous prime is 42771660619. The next prime is 42771660707. The reversal of 42771660643 is 34606617724.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42771660643 - 2²¹ = 42769563491 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42771660593 and 42771660602.

It is not a weakly prime, because it can be changed into another prime (42771660443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21385830321 + 21385830322.

It is an arithmetic number, because the mean of its divisors is an integer number (21385830322).

Almost surely, 2^42771660643 is an apocalyptic number.

42771660643 is a deficient number, since it is larger than the sum of its proper divisors (1).

42771660643 is an equidigital number, since it uses as much as digits as its factorization.

42771660643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1016064, while the sum is 46.

The spelling of 42771660643 in words is "forty-two billion, seven hundred seventy-one million, six hundred sixty thousand, six hundred forty-three".