65783500821761 has 4 divisors (see below), whose sum is σ = 65891875617792. Its totient is φ = 65675126025732.

The previous prime is 65783500821739. The next prime is 65783500821763. The reversal of 65783500821761 is 16712800538756.

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 a de Polignac number, because none of the positive numbers 2^k-65783500821761 is a prime.

It is a super-2 number, since 2×65783500821761² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65783500821761.

It is not an unprimeable number, because it can be changed into a prime (65783500821763) 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, 54187397105 + ... + 54187398318.

It is an arithmetic number, because the mean of its divisors is an integer number (16472968904448).

Almost surely, 2^{65783500821761} is an apocalyptic number.

It is an amenable number.

65783500821761 is a deficient number, since it is larger than the sum of its proper divisors (108374796031).

65783500821761 is a wasteful number, since it uses less digits than its factorization.

65783500821761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108374796030.

The product of its (nonzero) digits is 16934400, while the sum is 59.

The spelling of 65783500821761 in words is "sixty-five trillion, seven hundred eighty-three billion, five hundred million, eight hundred twenty-one thousand, seven hundred sixty-one".