65505621 has 8 divisors (see below), whose sum is σ = 88142560. Its totient is φ = 43269552.

The previous prime is 65505589. The next prime is 65505647. The reversal of 65505621 is 12650556.

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

It is not a de Polignac number, because 65505621 - 2⁵ = 65505589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65505421) 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, 99835 + ... + 100488.

It is an arithmetic number, because the mean of its divisors is an integer number (11017820).

Almost surely, 2^65505621 is an apocalyptic number.

It is an amenable number.

65505621 is a deficient number, since it is larger than the sum of its proper divisors (22636939).

65505621 is a wasteful number, since it uses less digits than its factorization.

65505621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200435.

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 65505621 is about 8093.5542872091. The cubic root of 65505621 is about 403.1124295581.

The spelling of 65505621 in words is "sixty-five million, five hundred five thousand, six hundred twenty-one".