65716742221 has 4 divisors (see below), whose sum is σ = 70771876252. Its totient is φ = 60661608192.

The previous prime is 65716742197. The next prime is 65716742237. The reversal of 65716742221 is 12224761756.

65716742221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8600522121 + 57116220100 = 92739^2 + 238990^2 .

It is a cyclic number.

It is not a de Polignac number, because 65716742221 - 2¹⁹ = 65716217933 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 (65716742281) 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, 2527566996 + ... + 2527567021.

It is an arithmetic number, because the mean of its divisors is an integer number (17692969063).

Almost surely, 2^65716742221 is an apocalyptic number.

It is an amenable number.

65716742221 is a deficient number, since it is larger than the sum of its proper divisors (5055134031).

65716742221 is a wasteful number, since it uses less digits than its factorization.

65716742221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5055134030.

The product of its digits is 282240, while the sum is 43.

The spelling of 65716742221 in words is "sixty-five billion, seven hundred sixteen million, seven hundred forty-two thousand, two hundred twenty-one".