65972771 has 2 divisors, whose sum is σ = 65972772. Its totient is φ = 65972770.

The previous prime is 65972749. The next prime is 65972773. The reversal of 65972771 is 17727956.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65972771 is a prime.

Together with 65972773, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (65972773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32986385 + 32986386.

It is an arithmetic number, because the mean of its divisors is an integer number (32986386).

Almost surely, 2^65972771 is an apocalyptic number.

65972771 is a deficient number, since it is larger than the sum of its proper divisors (1).

65972771 is an equidigital number, since it uses as much as digits as its factorization.

65972771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 185220, while the sum is 44.

The square root of 65972771 is about 8122.3624026511. The cubic root of 65972771 is about 404.0684192033.

The spelling of 65972771 in words is "sixty-five million, nine hundred seventy-two thousand, seven hundred seventy-one".