65854939221 has 20 divisors (see below), whose sum is σ = 102653112672. Its totient is φ = 41994452808.

The previous prime is 65854939211. The next prime is 65854939229. The reversal of 65854939221 is 12293945856.

65854939221 is a `hidden beast` number, since 6 + 5 + 8 + 549 + 3 + 92 + 2 + 1 = 666.

It is not a de Polignac number, because 65854939221 - 2¹⁰ = 65854938197 is a prime.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65854939229) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 17672571 + ... + 17676296.

Almost surely, 2^65854939221 is an apocalyptic number.

It is an amenable number.

65854939221 is a deficient number, since it is larger than the sum of its proper divisors (36798173451).

65854939221 is a wasteful number, since it uses less digits than its factorization.

65854939221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35348902 (or 35348893 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 54.

The spelling of 65854939221 in words is "sixty-five billion, eight hundred fifty-four million, nine hundred thirty-nine thousand, two hundred twenty-one".