65581312757 has 4 divisors (see below), whose sum is σ = 65588137440. Its totient is φ = 65574488076.

The previous prime is 65581312747. The next prime is 65581312831. The reversal of 65581312757 is 75721318556.

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 65581312757 - 2²⁶ = 65514203893 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 (65581312747) 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, 3397907 + ... + 3417152.

It is an arithmetic number, because the mean of its divisors is an integer number (16397034360).

Almost surely, 2^65581312757 is an apocalyptic number.

It is an amenable number.

65581312757 is a deficient number, since it is larger than the sum of its proper divisors (6824683).

65581312757 is an equidigital number, since it uses as much as digits as its factorization.

65581312757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6824682.

The product of its digits is 1764000, while the sum is 50.

The spelling of 65581312757 in words is "sixty-five billion, five hundred eighty-one million, three hundred twelve thousand, seven hundred fifty-seven".