65721207071 has 4 divisors (see below), whose sum is σ = 70776684552. Its totient is φ = 60665729592.

The previous prime is 65721207053. The next prime is 65721207089. The reversal of 65721207071 is 17070212756.

65721207071 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 is an interprime number because it is at equal distance from previous prime (65721207053) and next prime (65721207089).

It is not a de Polignac number, because 65721207071 - 2¹⁴ = 65721190687 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 (65721207031) 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, 2527738721 + ... + 2527738746.

It is an arithmetic number, because the mean of its divisors is an integer number (17694171138).

Almost surely, 2^65721207071 is an apocalyptic number.

65721207071 is a deficient number, since it is larger than the sum of its proper divisors (5055477481).

65721207071 is a wasteful number, since it uses less digits than its factorization.

65721207071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5055477480.

The product of its (nonzero) digits is 41160, while the sum is 38.

The spelling of 65721207071 in words is "sixty-five billion, seven hundred twenty-one million, two hundred seven thousand, seventy-one".