65663131 has 8 divisors (see below), whose sum is σ = 67073184. Its totient is φ = 64259520.

The previous prime is 65663119. The next prime is 65663159. The reversal of 65663131 is 13136656.

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 65663131 - 2¹¹ = 65661083 is a prime.

It is a super-2 number, since 2×65663131² = 8623293545446322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65663093 and 65663102.

It is not an unprimeable number, because it can be changed into a prime (65663161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22866 + ... + 25576.

It is an arithmetic number, because the mean of its divisors is an integer number (8384148).

Almost surely, 2^65663131 is an apocalyptic number.

65663131 is a deficient number, since it is larger than the sum of its proper divisors (1410053).

65663131 is a wasteful number, since it uses less digits than its factorization.

65663131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3221.

The product of its digits is 9720, while the sum is 31.

The square root of 65663131 is about 8103.2790276529. The cubic root of 65663131 is about 403.4352691073.

Adding to 65663131 its reverse (13136656), we get a palindrome (78799787).

The spelling of 65663131 in words is "sixty-five million, six hundred sixty-three thousand, one hundred thirty-one".