42443220331601 has 2 divisors, whose sum is σ = 42443220331602. Its totient is φ = 42443220331600.

The previous prime is 42443220331549. The next prime is 42443220331663. The reversal of 42443220331601 is 10613302234424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39287836536001 + 3155383795600 = 6268001^2 + 1776340^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42443220331601 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (42443220331801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21221610165800 + 21221610165801.

It is an arithmetic number, because the mean of its divisors is an integer number (21221610165801).

Almost surely, 2^{42443220331601} is an apocalyptic number.

It is an amenable number.

42443220331601 is a deficient number, since it is larger than the sum of its proper divisors (1).

42443220331601 is an equidigital number, since it uses as much as digits as its factorization.

42443220331601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 35.

The spelling of 42443220331601 in words is "forty-two trillion, four hundred forty-three billion, two hundred twenty million, three hundred thirty-one thousand, six hundred one".