65551401 has 12 divisors (see below), whose sum is σ = 95555460. Its totient is φ = 43299360.

The previous prime is 65551379. The next prime is 65551429. The reversal of 65551401 is 10415556.

It is a happy number.

65551401 is a `hidden beast` number, since 655 + 5 + 1 + 4 + 0 + 1 = 666.

65551401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 26163225 + 39388176 = 5115^2 + 6276^2 .

It is not a de Polignac number, because 65551401 - 2⁹ = 65550889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65551601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32430 + ... + 34391.

It is an arithmetic number, because the mean of its divisors is an integer number (7962955).

Almost surely, 2^65551401 is an apocalyptic number.

It is an amenable number.

65551401 is a deficient number, since it is larger than the sum of its proper divisors (30004059).

65551401 is a wasteful number, since it uses less digits than its factorization.

65551401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66936 (or 66933 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 65551401 is about 8096.3819697443. The cubic root of 65551401 is about 403.2063155958.

Adding to 65551401 its reverse (10415556), we get a palindrome (75966957).

The spelling of 65551401 in words is "sixty-five million, five hundred fifty-one thousand, four hundred one".