65066399 has 4 divisors (see below), whose sum is σ = 65099664. Its totient is φ = 65033136.

The previous prime is 65066389. The next prime is 65066411. The reversal of 65066399 is 99366056.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65066399 - 2¹⁶ = 65000863 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 (65066329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13502 + ... + 17675.

It is an arithmetic number, because the mean of its divisors is an integer number (16274916).

Almost surely, 2^65066399 is an apocalyptic number.

65066399 is a deficient number, since it is larger than the sum of its proper divisors (33265).

65066399 is a wasteful number, since it uses less digits than its factorization.

65066399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33264.

The product of its (nonzero) digits is 262440, while the sum is 44.

The square root of 65066399 is about 8066.3745883761. The cubic root of 65066399 is about 402.2094380718.

The spelling of 65066399 in words is "sixty-five million, sixty-six thousand, three hundred ninety-nine".