65243634257 has 8 divisors (see below), whose sum is σ = 66925339776. Its totient is φ = 63574159792.

The previous prime is 65243634221. The next prime is 65243634271. The reversal of 65243634257 is 75243634256.

65243634257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65243634257 - 2¹⁶ = 65243568721 is a prime.

It is a super-3 number, since 3×65243634257³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65243634857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3046958 + ... + 3068295.

It is an arithmetic number, because the mean of its divisors is an integer number (8365667472).

Almost surely, 2^65243634257 is an apocalyptic number.

It is an amenable number.

65243634257 is a deficient number, since it is larger than the sum of its proper divisors (1681705519).

65243634257 is a wasteful number, since it uses less digits than its factorization.

65243634257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6115527.

The product of its digits is 3628800, while the sum is 47.

Subtracting 65243634257 from its reverse (75243634256), we obtain a palindrome (9999999999).

The spelling of 65243634257 in words is "sixty-five billion, two hundred forty-three million, six hundred thirty-four thousand, two hundred fifty-seven".