65243636661 has 24 divisors (see below), whose sum is σ = 101753337504. Its totient is φ = 37076084640.

The previous prime is 65243636657. The next prime is 65243636663. The reversal of 65243636661 is 16663634256.

It is not a de Polignac number, because 65243636661 - 2² = 65243636657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65243636661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65243636663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1199455 + ... + 1252668.

It is an arithmetic number, because the mean of its divisors is an integer number (4239722396).

Almost surely, 2^65243636661 is an apocalyptic number.

It is an amenable number.

65243636661 is a deficient number, since it is larger than the sum of its proper divisors (36509700843).

65243636661 is a wasteful number, since it uses less digits than its factorization.

65243636661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2452321 (or 2452314 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 48.

The spelling of 65243636661 in words is "sixty-five billion, two hundred forty-three million, six hundred thirty-six thousand, six hundred sixty-one".