65899139 has 2 divisors, whose sum is σ = 65899140. Its totient is φ = 65899138.

The previous prime is 65899129. The next prime is 65899151. The reversal of 65899139 is 93199856.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65899139 - 2²⁴ = 49121923 is a prime.

It is not a weakly prime, because it can be changed into another prime (65899129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32949569 + 32949570.

It is an arithmetic number, because the mean of its divisors is an integer number (32949570).

Almost surely, 2^65899139 is an apocalyptic number.

65899139 is a deficient number, since it is larger than the sum of its proper divisors (1).

65899139 is an equidigital number, since it uses as much as digits as its factorization.

65899139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 50.

The square root of 65899139 is about 8117.8284657906. The cubic root of 65899139 is about 403.9180367496.

The spelling of 65899139 in words is "sixty-five million, eight hundred ninety-nine thousand, one hundred thirty-nine".