65409723989 has 4 divisors (see below), whose sum is σ = 68253625056. Its totient is φ = 62565822924.

The previous prime is 65409723971. The next prime is 65409723997. The reversal of 65409723989 is 98932790456.

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 65409723989 - 2²⁰ = 65408675413 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 (65409723959) 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, 1421950499 + ... + 1421950544.

It is an arithmetic number, because the mean of its divisors is an integer number (17063406264).

Almost surely, 2^65409723989 is an apocalyptic number.

It is an amenable number.

65409723989 is a deficient number, since it is larger than the sum of its proper divisors (2843901067).

65409723989 is a wasteful number, since it uses less digits than its factorization.

65409723989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2843901066.

The product of its (nonzero) digits is 29393280, while the sum is 62.

The spelling of 65409723989 in words is "sixty-five billion, four hundred nine million, seven hundred twenty-three thousand, nine hundred eighty-nine".