65899009 has 4 divisors (see below), whose sum is σ = 71889840. Its totient is φ = 59908180.

The previous prime is 65898983. The next prime is 65899033. The reversal of 65899009 is 90099856.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65899009 - 2⁵ = 65898977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65899009.

It is not an unprimeable number, because it can be changed into a prime (65899039) 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, 2995399 + ... + 2995420.

It is an arithmetic number, because the mean of its divisors is an integer number (17972460).

Almost surely, 2^65899009 is an apocalyptic number.

It is an amenable number.

65899009 is a deficient number, since it is larger than the sum of its proper divisors (5990831).

65899009 is a wasteful number, since it uses less digits than its factorization.

65899009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5990830.

The product of its (nonzero) digits is 174960, while the sum is 46.

The square root of 65899009 is about 8117.8204587192. The cubic root of 65899009 is about 403.9177711448.

The spelling of 65899009 in words is "sixty-five million, eight hundred ninety-nine thousand, nine".