42243636397 has 2 divisors, whose sum is σ = 42243636398. Its totient is φ = 42243636396.

The previous prime is 42243636353. The next prime is 42243636439. The reversal of 42243636397 is 79363634224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39641208201 + 2602428196 = 199101^2 + 51014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42243636397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42243636397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42243636307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21121818198 + 21121818199.

It is an arithmetic number, because the mean of its divisors is an integer number (21121818199).

Almost surely, 2^42243636397 is an apocalyptic number.

It is an amenable number.

42243636397 is a deficient number, since it is larger than the sum of its proper divisors (1).

42243636397 is an equidigital number, since it uses as much as digits as its factorization.

42243636397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3919104, while the sum is 49.

The spelling of 42243636397 in words is "forty-two billion, two hundred forty-three million, six hundred thirty-six thousand, three hundred ninety-seven".