65994009 has 16 divisors (see below), whose sum is σ = 92327424. Its totient is φ = 41875200.

The previous prime is 65993987. The next prime is 65994013. The reversal of 65994009 is 90049956.

It is a happy number.

It is not a de Polignac number, because 65994009 - 2¹⁹ = 65469721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65994109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144 + ... + 11489.

It is an arithmetic number, because the mean of its divisors is an integer number (5770464).

Almost surely, 2^65994009 is an apocalyptic number.

It is an amenable number.

65994009 is a deficient number, since it is larger than the sum of its proper divisors (26333415).

65994009 is a wasteful number, since it uses less digits than its factorization.

65994009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11728.

The product of its (nonzero) digits is 87480, while the sum is 42.

The square root of 65994009 is about 8123.6696757069. The cubic root of 65994009 is about 404.1117738796. Note that the first 3 decimals are identical.

The spelling of 65994009 in words is "sixty-five million, nine hundred ninety-four thousand, nine".