65139616 has 24 divisors (see below), whose sum is σ = 128568384. Its totient is φ = 32487360.

The previous prime is 65139593. The next prime is 65139617. The reversal of 65139616 is 61693156.

It is not an unprimeable number, because it can be changed into a prime (65139617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11431 + ... + 16153.

It is an arithmetic number, because the mean of its divisors is an integer number (5357016).

Almost surely, 2^65139616 is an apocalyptic number.

It is an amenable number.

65139616 is a deficient number, since it is larger than the sum of its proper divisors (63428768).

65139616 is a wasteful number, since it uses less digits than its factorization.

65139616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5164 (or 5156 counting only the distinct ones).

The product of its digits is 29160, while the sum is 37.

The square root of 65139616 is about 8070.9117204935. The cubic root of 65139616 is about 402.3602457081.

It can be divided in two parts, 6513 and 9616, that added together give a square (16129 = 127²).

The spelling of 65139616 in words is "sixty-five million, one hundred thirty-nine thousand, six hundred sixteen".