65216401 has 4 divisors (see below), whose sum is σ = 66604032. Its totient is φ = 63828772.

The previous prime is 65216399. The next prime is 65216413. The reversal of 65216401 is 10461256.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65216401 - 2¹ = 65216399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65216461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 693745 + ... + 693838.

It is an arithmetic number, because the mean of its divisors is an integer number (16651008).

Almost surely, 2^65216401 is an apocalyptic number.

It is an amenable number.

65216401 is a deficient number, since it is larger than the sum of its proper divisors (1387631).

65216401 is a wasteful number, since it uses less digits than its factorization.

65216401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1387630.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 65216401 is about 8075.6672170168. The cubic root of 65216401 is about 402.5182811290.

Adding to 65216401 its reverse (10461256), we get a palindrome (75677657).

The spelling of 65216401 in words is "sixty-five million, two hundred sixteen thousand, four hundred one".