65139655 has 24 divisors (see below), whose sum is σ = 92562912. Its totient is φ = 43107456.

The previous prime is 65139653. The next prime is 65139661. The reversal of 65139655 is 55693156.

It is not a de Polignac number, because 65139655 - 2¹ = 65139653 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65139653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28329 + ... + 30541.

It is an arithmetic number, because the mean of its divisors is an integer number (3856788).

Almost surely, 2^65139655 is an apocalyptic number.

65139655 is a deficient number, since it is larger than the sum of its proper divisors (27423257).

65139655 is a wasteful number, since it uses less digits than its factorization.

65139655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2283 (or 2254 counting only the distinct ones).

The product of its digits is 121500, while the sum is 40.

The square root of 65139655 is about 8070.9141365771. The cubic root of 65139655 is about 402.3603260076.

The spelling of 65139655 in words is "sixty-five million, one hundred thirty-nine thousand, six hundred fifty-five".