65373221 has 8 divisors (see below), whose sum is σ = 68905080. Its totient is φ = 61926592.

The previous prime is 65373197. The next prime is 65373227. The reversal of 65373221 is 12237356.

It can be written as a sum of positive squares in 4 ways, for example, as 10982596 + 54390625 = 3314^2 + 7375^2 .

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 65373221 - 2¹⁸ = 65111077 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65373227) 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, 19730 + ... + 22803.

It is an arithmetic number, because the mean of its divisors is an integer number (8613135).

Almost surely, 2^65373221 is an apocalyptic number.

It is an amenable number.

65373221 is a deficient number, since it is larger than the sum of its proper divisors (3531859).

65373221 is a wasteful number, since it uses less digits than its factorization.

65373221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42615.

The product of its digits is 7560, while the sum is 29.

The square root of 65373221 is about 8085.3708016392. The cubic root of 65373221 is about 402.8406560123.

The spelling of 65373221 in words is "sixty-five million, three hundred seventy-three thousand, two hundred twenty-one".