65139649 has 8 divisors (see below), whose sum is σ = 67527680. Its totient is φ = 62769600.

The previous prime is 65139629. The next prime is 65139653. The reversal of 65139649 is 94693156.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65139649 - 2⁵ = 65139617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65139629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3112 + ... + 11830.

It is an arithmetic number, because the mean of its divisors is an integer number (8440960).

Almost surely, 2^65139649 is an apocalyptic number.

It is an amenable number.

65139649 is a deficient number, since it is larger than the sum of its proper divisors (2388031).

65139649 is a wasteful number, since it uses less digits than its factorization.

65139649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8991.

The product of its digits is 174960, while the sum is 43.

The square root of 65139649 is about 8070.9137648720. The cubic root of 65139649 is about 402.3603136539.

The spelling of 65139649 in words is "sixty-five million, one hundred thirty-nine thousand, six hundred forty-nine".