65221571 has 8 divisors (see below), whose sum is σ = 70528320. Its totient is φ = 60078208.

The previous prime is 65221553. The next prime is 65221579. The reversal of 65221571 is 17512256.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65221571 - 2¹⁴ = 65205187 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (65221579) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40016 + ... + 41613.

It is an arithmetic number, because the mean of its divisors is an integer number (8816040).

Almost surely, 2^65221571 is an apocalyptic number.

65221571 is a deficient number, since it is larger than the sum of its proper divisors (5306749).

65221571 is a wasteful number, since it uses less digits than its factorization.

65221571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81693.

The product of its digits is 4200, while the sum is 29.

The square root of 65221571 is about 8075.9873080633. The cubic root of 65221571 is about 402.5289173314.

The spelling of 65221571 in words is "sixty-five million, two hundred twenty-one thousand, five hundred seventy-one".