65685971 has 4 divisors (see below), whose sum is σ = 70738752. Its totient is φ = 60633192.

The previous prime is 65685967. The next prime is 65686003. The reversal of 65685971 is 17958656.

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

It is a cyclic number.

It is not a de Polignac number, because 65685971 - 2² = 65685967 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65685901) 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, 2526371 + ... + 2526396.

It is an arithmetic number, because the mean of its divisors is an integer number (17684688).

Almost surely, 2^65685971 is an apocalyptic number.

65685971 is a deficient number, since it is larger than the sum of its proper divisors (5052781).

65685971 is a wasteful number, since it uses less digits than its factorization.

65685971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5052780.

The product of its digits is 453600, while the sum is 47.

The square root of 65685971 is about 8104.6882111529. The cubic root of 65685971 is about 403.4820401199.

The spelling of 65685971 in words is "sixty-five million, six hundred eighty-five thousand, nine hundred seventy-one".