65121066 has 24 divisors (see below), whose sum is σ = 145962180. Its totient is φ = 20958336.

The previous prime is 65121041. The next prime is 65121071. The reversal of 65121066 is 66012156.

It is a happy number.

65121066 is a `hidden beast` number, since 651 + 2 + 1 + 0 + 6 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 56565441 + 8555625 = 7521^2 + 2925^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61855 + ... + 62898.

Almost surely, 2^65121066 is an apocalyptic number.

65121066 is an abundant number, since it is smaller than the sum of its proper divisors (80841114).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65121066 is a wasteful number, since it uses less digits than its factorization.

65121066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124790 (or 124787 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 65121066 is about 8069.7624500353. The cubic root of 65121066 is about 402.3220483119.

The spelling of 65121066 in words is "sixty-five million, one hundred twenty-one thousand, sixty-six".