65257621 has 16 divisors (see below), whose sum is σ = 77249088. Its totient is φ = 54345600.

The previous prime is 65257589. The next prime is 65257637. The reversal of 65257621 is 12675256.

65257621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 65257621 - 2⁵ = 65257589 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 (65257651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17926 + ... + 21256.

It is an arithmetic number, because the mean of its divisors is an integer number (4828068).

Almost surely, 2^65257621 is an apocalyptic number.

It is an amenable number.

65257621 is a deficient number, since it is larger than the sum of its proper divisors (11991467).

65257621 is a wasteful number, since it uses less digits than its factorization.

65257621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3492.

The product of its digits is 25200, while the sum is 34.

The square root of 65257621 is about 8078.2189249859. The cubic root of 65257621 is about 402.6030671077.

The spelling of 65257621 in words is "sixty-five million, two hundred fifty-seven thousand, six hundred twenty-one".