65549971 has 4 divisors (see below), whose sum is σ = 65601432. Its totient is φ = 65498512.

The previous prime is 65549951. The next prime is 65549983. The reversal of 65549971 is 17994556.

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-65549971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65549951) 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, 23770 + ... + 26383.

It is an arithmetic number, because the mean of its divisors is an integer number (16400358).

Almost surely, 2^65549971 is an apocalyptic number.

65549971 is a deficient number, since it is larger than the sum of its proper divisors (51461).

65549971 is a wasteful number, since it uses less digits than its factorization.

65549971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51460.

The product of its digits is 340200, while the sum is 46.

The square root of 65549971 is about 8096.2936582118. The cubic root of 65549971 is about 403.2033836003.

The spelling of 65549971 in words is "sixty-five million, five hundred forty-nine thousand, nine hundred seventy-one".