65897771 has 4 divisors (see below), whose sum is σ = 66732000. Its totient is φ = 65063544.

The previous prime is 65897761. The next prime is 65897779. The reversal of 65897771 is 17779856.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65897771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65897779) 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, 416996 + ... + 417153.

It is an arithmetic number, because the mean of its divisors is an integer number (16683000).

Almost surely, 2^65897771 is an apocalyptic number.

65897771 is a deficient number, since it is larger than the sum of its proper divisors (834229).

65897771 is an equidigital number, since it uses as much as digits as its factorization.

65897771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834228.

The product of its digits is 740880, while the sum is 50.

The square root of 65897771 is about 8117.7442063667. The cubic root of 65897771 is about 403.9152417525.

The spelling of 65897771 in words is "sixty-five million, eight hundred ninety-seven thousand, seven hundred seventy-one".