65018909 has 4 divisors (see below), whose sum is σ = 65035260. Its totient is φ = 65002560.

The previous prime is 65018903. The next prime is 65018911. The reversal of 65018909 is 90981056.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 31956409 + 33062500 = 5653^2 + 5750^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65018909 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65018903) 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, 2069 + ... + 11589.

It is an arithmetic number, because the mean of its divisors is an integer number (16258815).

Almost surely, 2^65018909 is an apocalyptic number.

It is an amenable number.

65018909 is a deficient number, since it is larger than the sum of its proper divisors (16351).

65018909 is an equidigital number, since it uses as much as digits as its factorization.

65018909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16350.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 65018909 is about 8063.4303494233. The cubic root of 65018909 is about 402.1115607472. Note that the first 3 decimals are identical.

The spelling of 65018909 in words is "sixty-five million, eighteen thousand, nine hundred nine".