65216331 has 12 divisors (see below), whose sum is σ = 97450080. Its totient is φ = 41978160.

The previous prime is 65216321. The next prime is 65216353. The reversal of 65216331 is 13361256.

65216331 is a `hidden beast` number, since 6 + 5 + 21 + 633 + 1 = 666.

It is not a de Polignac number, because 65216331 - 2⁹ = 65215819 is a prime.

It is a super-2 number, since 2×65216331² = 8506339658203122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 65216295 and 65216304.

It is not an unprimeable number, because it can be changed into a prime (65216321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 124675 + ... + 125196.

It is an arithmetic number, because the mean of its divisors is an integer number (8120840).

Almost surely, 2^65216331 is an apocalyptic number.

65216331 is a deficient number, since it is larger than the sum of its proper divisors (32233749).

65216331 is a wasteful number, since it uses less digits than its factorization.

65216331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249906 (or 249903 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 65216331 is about 8075.6628830084. The cubic root of 65216331 is about 402.5181371146.

Adding to 65216331 its reverse (13361256), we get a palindrome (78577587).

The spelling of 65216331 in words is "sixty-five million, two hundred sixteen thousand, three hundred thirty-one".