65775971 has 2 divisors, whose sum is σ = 65775972. Its totient is φ = 65775970.

The previous prime is 65775959. The next prime is 65776001. The reversal of 65775971 is 17957756.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65775971 is a prime.

It is not a weakly prime, because it can be changed into another prime (65775911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32887985 + 32887986.

It is an arithmetic number, because the mean of its divisors is an integer number (32887986).

Almost surely, 2^65775971 is an apocalyptic number.

65775971 is a deficient number, since it is larger than the sum of its proper divisors (1).

65775971 is an equidigital number, since it uses as much as digits as its factorization.

65775971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 463050, while the sum is 47.

The square root of 65775971 is about 8110.2386524689. The cubic root of 65775971 is about 403.6662337444. Note that the first 3 decimals are identical.

The spelling of 65775971 in words is "sixty-five million, seven hundred seventy-five thousand, nine hundred seventy-one".