65655421 has 4 divisors (see below), whose sum is σ = 70705852. Its totient is φ = 60604992.

The previous prime is 65655419. The next prime is 65655433. The reversal of 65655421 is 12455656.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19483396 + 46172025 = 4414^2 + 6795^2 .

It is a cyclic number.

It is not a de Polignac number, because 65655421 - 2¹ = 65655419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65655461) 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 3 ways as a sum of consecutive naturals, for example, 2525196 + ... + 2525221.

It is an arithmetic number, because the mean of its divisors is an integer number (17676463).

Almost surely, 2^65655421 is an apocalyptic number.

It is an amenable number.

65655421 is a deficient number, since it is larger than the sum of its proper divisors (5050431).

65655421 is a wasteful number, since it uses less digits than its factorization.

65655421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5050430.

The product of its digits is 36000, while the sum is 34.

The square root of 65655421 is about 8102.8032803469. The cubic root of 65655421 is about 403.4194783705.

The spelling of 65655421 in words is "sixty-five million, six hundred fifty-five thousand, four hundred twenty-one".