42166564243 has 2 divisors, whose sum is σ = 42166564244. Its totient is φ = 42166564242.

The previous prime is 42166564229. The next prime is 42166564247. The reversal of 42166564243 is 34246566124.

42166564243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42166564243 - 2³³ = 33576629651 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42166564243.

It is not a weakly prime, because it can be changed into another prime (42166564247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21083282121 + 21083282122.

It is an arithmetic number, because the mean of its divisors is an integer number (21083282122).

Almost surely, 2^42166564243 is an apocalyptic number.

42166564243 is a deficient number, since it is larger than the sum of its proper divisors (1).

42166564243 is an equidigital number, since it uses as much as digits as its factorization.

42166564243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 829440, while the sum is 43.

The spelling of 42166564243 in words is "forty-two billion, one hundred sixty-six million, five hundred sixty-four thousand, two hundred forty-three".