65949871 has 4 divisors (see below), whose sum is σ = 71022952. Its totient is φ = 60876792.

The previous prime is 65949847. The next prime is 65949881. The reversal of 65949871 is 17894956.

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 65949871 - 2¹⁷ = 65818799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65949811) 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, 2536521 + ... + 2536546.

It is an arithmetic number, because the mean of its divisors is an integer number (17755738).

Almost surely, 2^65949871 is an apocalyptic number.

65949871 is a deficient number, since it is larger than the sum of its proper divisors (5073081).

65949871 is a wasteful number, since it uses less digits than its factorization.

65949871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5073080.

The product of its digits is 544320, while the sum is 49.

The square root of 65949871 is about 8120.9525919069. The cubic root of 65949871 is about 404.0216613390.

The spelling of 65949871 in words is "sixty-five million, nine hundred forty-nine thousand, eight hundred seventy-one".