65720071 has 2 divisors, whose sum is σ = 65720072. Its totient is φ = 65720070.

The previous prime is 65720063. The next prime is 65720117. The reversal of 65720071 is 17002756.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65720071 - 2³ = 65720063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65700071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32860035 + 32860036.

It is an arithmetic number, because the mean of its divisors is an integer number (32860036).

Almost surely, 2^65720071 is an apocalyptic number.

65720071 is a deficient number, since it is larger than the sum of its proper divisors (1).

65720071 is an equidigital number, since it uses as much as digits as its factorization.

65720071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 65720071 is about 8106.7916588500. The cubic root of 65720071 is about 403.5518488232.

The spelling of 65720071 in words is "sixty-five million, seven hundred twenty thousand, seventy-one".