65135639 has 2 divisors, whose sum is σ = 65135640. Its totient is φ = 65135638.

The previous prime is 65135627. The next prime is 65135657. The reversal of 65135639 is 93653156.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65135639 - 2¹² = 65131543 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65135699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32567819 + 32567820.

It is an arithmetic number, because the mean of its divisors is an integer number (32567820).

Almost surely, 2^65135639 is an apocalyptic number.

65135639 is a deficient number, since it is larger than the sum of its proper divisors (1).

65135639 is an equidigital number, since it uses as much as digits as its factorization.

65135639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72900, while the sum is 38.

The square root of 65135639 is about 8070.6653381242. The cubic root of 65135639 is about 402.3520570442.

The spelling of 65135639 in words is "sixty-five million, one hundred thirty-five thousand, six hundred thirty-nine".