65540543 has 2 divisors, whose sum is σ = 65540544. Its totient is φ = 65540542.

The previous prime is 65540483. The next prime is 65540561. The reversal of 65540543 is 34504556.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65540543 - 2¹⁸ = 65278399 is a prime.

It is a super-3 number, since 3×65540543³ (a number of 24 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65540143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32770271 + 32770272.

It is an arithmetic number, because the mean of its divisors is an integer number (32770272).

Almost surely, 2^65540543 is an apocalyptic number.

65540543 is a deficient number, since it is larger than the sum of its proper divisors (1).

65540543 is an equidigital number, since it uses as much as digits as its factorization.

65540543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36000, while the sum is 32.

The square root of 65540543 is about 8095.7113955476. The cubic root of 65540543 is about 403.1840518665.

The spelling of 65540543 in words is "sixty-five million, five hundred forty thousand, five hundred forty-three".