65840539 has 2 divisors, whose sum is σ = 65840540. Its totient is φ = 65840538.

The previous prime is 65840531. The next prime is 65840549. The reversal of 65840539 is 93504856.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65840539 - 2³ = 65840531 is a prime.

It is not a weakly prime, because it can be changed into another prime (65840531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32920269 + 32920270.

It is an arithmetic number, because the mean of its divisors is an integer number (32920270).

Almost surely, 2^65840539 is an apocalyptic number.

65840539 is a deficient number, since it is larger than the sum of its proper divisors (1).

65840539 is an equidigital number, since it uses as much as digits as its factorization.

65840539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 65840539 is about 8114.2183234123. The cubic root of 65840539 is about 403.7982748592.

The spelling of 65840539 in words is "sixty-five million, eight hundred forty thousand, five hundred thirty-nine".