42043635541 has 2 divisors, whose sum is σ = 42043635542. Its totient is φ = 42043635540.

The previous prime is 42043635533. The next prime is 42043635559. The reversal of 42043635541 is 14553634024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29828744100 + 12214891441 = 172710^2 + 110521^2 .

It is a cyclic number.

It is not a de Polignac number, because 42043635541 - 2³ = 42043635533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42043635541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42043635521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21021817770 + 21021817771.

It is an arithmetic number, because the mean of its divisors is an integer number (21021817771).

Almost surely, 2^42043635541 is an apocalyptic number.

It is an amenable number.

42043635541 is a deficient number, since it is larger than the sum of its proper divisors (1).

42043635541 is an equidigital number, since it uses as much as digits as its factorization.

42043635541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172800, while the sum is 37.

The spelling of 42043635541 in words is "forty-two billion, forty-three million, six hundred thirty-five thousand, five hundred forty-one".