65345621 has 8 divisors (see below), whose sum is σ = 71347584. Its totient is φ = 59353920.

The previous prime is 65345611. The next prime is 65345629. The reversal of 65345621 is 12654356.

65345621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 65345621 - 2¹⁴ = 65329237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65345629) 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 7 ways as a sum of consecutive naturals, for example, 17876 + ... + 21218.

It is an arithmetic number, because the mean of its divisors is an integer number (8918448).

Almost surely, 2^65345621 is an apocalyptic number.

It is an amenable number.

65345621 is a deficient number, since it is larger than the sum of its proper divisors (6001963).

65345621 is a wasteful number, since it uses less digits than its factorization.

65345621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5131.

The product of its digits is 21600, while the sum is 32.

The square root of 65345621 is about 8083.6638351678. The cubic root of 65345621 is about 402.7839561027.

Adding to 65345621 its reverse (12654356), we get a palindrome (77999977).

The spelling of 65345621 in words is "sixty-five million, three hundred forty-five thousand, six hundred twenty-one".