65640053213 has 4 divisors (see below), whose sum is σ = 75017203680. Its totient is φ = 56262902748.

The previous prime is 65640053209. The next prime is 65640053221. The reversal of 65640053213 is 31235004656.

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 65640053213 - 2² = 65640053209 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 (65640053273) 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, 4688575223 + ... + 4688575236.

It is an arithmetic number, because the mean of its divisors is an integer number (18754300920).

Almost surely, 2^65640053213 is an apocalyptic number.

It is an amenable number.

65640053213 is a deficient number, since it is larger than the sum of its proper divisors (9377150467).

65640053213 is an equidigital number, since it uses as much as digits as its factorization.

65640053213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9377150466.

The product of its (nonzero) digits is 64800, while the sum is 35.

Adding to 65640053213 its reverse (31235004656), we get a palindrome (96875057869).

The spelling of 65640053213 in words is "sixty-five billion, six hundred forty million, fifty-three thousand, two hundred thirteen".