65139861 has 8 divisors (see below), whose sum is σ = 87243520. Its totient is φ = 43231392.

The previous prime is 65139839. The next prime is 65139889. The reversal of 65139861 is 16893156.

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

It is not a de Polignac number, because 65139861 - 2¹⁰ = 65138837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65139161) 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, 48016 + ... + 49353.

It is an arithmetic number, because the mean of its divisors is an integer number (10905440).

Almost surely, 2^65139861 is an apocalyptic number.

It is an amenable number.

65139861 is a deficient number, since it is larger than the sum of its proper divisors (22103659).

65139861 is a wasteful number, since it uses less digits than its factorization.

65139861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97595.

The product of its digits is 38880, while the sum is 39.

The square root of 65139861 is about 8070.9268984423. The cubic root of 65139861 is about 402.3607501535.

The spelling of 65139861 in words is "sixty-five million, one hundred thirty-nine thousand, eight hundred sixty-one".