40243618155541 has 2 divisors, whose sum is σ = 40243618155542. Its totient is φ = 40243618155540.

The previous prime is 40243618155511. The next prime is 40243618155581. The reversal of 40243618155541 is 14555181634204.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28510794202500 + 11732823953041 = 5339550^2 + 3425321^2 .

It is a cyclic number.

It is not a de Polignac number, because 40243618155541 - 2¹³ = 40243618147349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40243618155511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20121809077770 + 20121809077771.

It is an arithmetic number, because the mean of its divisors is an integer number (20121809077771).

Almost surely, 2^{40243618155541} is an apocalyptic number.

It is an amenable number.

40243618155541 is a deficient number, since it is larger than the sum of its proper divisors (1).

40243618155541 is an equidigital number, since it uses as much as digits as its factorization.

40243618155541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304000, while the sum is 49.

Adding to 40243618155541 its reverse (14555181634204), we get a palindrome (54798799789745).

The spelling of 40243618155541 in words is "forty trillion, two hundred forty-three billion, six hundred eighteen million, one hundred fifty-five thousand, five hundred forty-one".