42818950393 has 2 divisors, whose sum is σ = 42818950394. Its totient is φ = 42818950392.

The previous prime is 42818950367. The next prime is 42818950403. The reversal of 42818950393 is 39305981824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35559399184 + 7259551209 = 188572^2 + 85203^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42818950393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42818950393.

It is not a weakly prime, because it can be changed into another prime (42818956393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21409475196 + 21409475197.

It is an arithmetic number, because the mean of its divisors is an integer number (21409475197).

Almost surely, 2^42818950393 is an apocalyptic number.

It is an amenable number.

42818950393 is a deficient number, since it is larger than the sum of its proper divisors (1).

42818950393 is an equidigital number, since it uses as much as digits as its factorization.

42818950393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1866240, while the sum is 52.

The spelling of 42818950393 in words is "forty-two billion, eight hundred eighteen million, nine hundred fifty thousand, three hundred ninety-three".