65663191 has 12 divisors (see below), whose sum is σ = 72760576. Its totient is φ = 59209920.

The previous prime is 65663189. The next prime is 65663201. The reversal of 65663191 is 19136656.

It is not a de Polignac number, because 65663191 - 2¹ = 65663189 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65663191.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13231 + ... + 17503.

Almost surely, 2^65663191 is an apocalyptic number.

65663191 is a deficient number, since it is larger than the sum of its proper divisors (7097385).

65663191 is a wasteful number, since it uses less digits than its factorization.

65663191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4422 (or 4411 counting only the distinct ones).

The product of its digits is 29160, while the sum is 37.

The square root of 65663191 is about 8103.2827298571. The cubic root of 65663191 is about 403.4353919876.

The spelling of 65663191 in words is "sixty-five million, six hundred sixty-three thousand, one hundred ninety-one".