65220581 has 8 divisors (see below), whose sum is σ = 66718080. Its totient is φ = 63733072.

The previous prime is 65220563. The next prime is 65220599. The reversal of 65220581 is 18502256.

It is an interprime number because it is at equal distance from previous prime (65220563) and next prime (65220599).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65220581 is a prime.

It is a super-2 number, since 2×65220581² = 8507448371955122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65220781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11600 + ... + 16278.

It is an arithmetic number, because the mean of its divisors is an integer number (8339760).

Almost surely, 2^65220581 is an apocalyptic number.

It is an amenable number.

65220581 is a deficient number, since it is larger than the sum of its proper divisors (1497499).

65220581 is a wasteful number, since it uses less digits than its factorization.

65220581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4995.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 65220581 is about 8075.9260150152. The cubic root of 65220581 is about 402.5268806553.

The spelling of 65220581 in words is "sixty-five million, two hundred twenty thousand, five hundred eighty-one".