65444421 has 16 divisors (see below), whose sum is σ = 100929024. Its totient is φ = 36945264.

The previous prime is 65444419. The next prime is 65444437. The reversal of 65444421 is 12444456.

It is a happy number.

It is not a de Polignac number, because 65444421 - 2¹ = 65444419 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65444411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17031 + ... + 20516.

It is an arithmetic number, because the mean of its divisors is an integer number (6308064).

Almost surely, 2^65444421 is an apocalyptic number.

It is an amenable number.

65444421 is a deficient number, since it is larger than the sum of its proper divisors (35484603).

65444421 is a wasteful number, since it uses less digits than its factorization.

65444421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37640.

The product of its digits is 15360, while the sum is 30.

The square root of 65444421 is about 8089.7726173237. The cubic root of 65444421 is about 402.9868516954.

Adding to 65444421 its reverse (12444456), we get a palindrome (77888877).

The spelling of 65444421 in words is "sixty-five million, four hundred forty-four thousand, four hundred twenty-one".