65066391 has 12 divisors (see below), whose sum is σ = 101214568. Its totient is φ = 40040784.

The previous prime is 65066389. The next prime is 65066411. The reversal of 65066391 is 19366056.

65066391 is a `hidden beast` number, since 6 + 506 + 63 + 91 = 666.

It is not a de Polignac number, because 65066391 - 2¹ = 65066389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65066371) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 277945 + ... + 278178.

Almost surely, 2^65066391 is an apocalyptic number.

65066391 is a deficient number, since it is larger than the sum of its proper divisors (36148177).

65066391 is a wasteful number, since it uses less digits than its factorization.

65066391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556142 (or 556139 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 65066391 is about 8066.3740924904. The cubic root of 65066391 is about 402.2094215877.

The spelling of 65066391 in words is "sixty-five million, sixty-six thousand, three hundred ninety-one".