65669421 has 4 divisors (see below), whose sum is σ = 87559232. Its totient is φ = 43779612.

The previous prime is 65669389. The next prime is 65669459. The reversal of 65669421 is 12496656.

65669421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 65669421 - 2⁵ = 65669389 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 65669421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65669621) 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 3 ways as a sum of consecutive naturals, for example, 10944901 + ... + 10944906.

It is an arithmetic number, because the mean of its divisors is an integer number (21889808).

Almost surely, 2^65669421 is an apocalyptic number.

It is an amenable number.

65669421 is a deficient number, since it is larger than the sum of its proper divisors (21889811).

65669421 is a wasteful number, since it uses less digits than its factorization.

65669421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21889810.

The product of its digits is 77760, while the sum is 39.

The square root of 65669421 is about 8103.6671328479. The cubic root of 65669421 is about 403.4481506477.

The spelling of 65669421 in words is "sixty-five million, six hundred sixty-nine thousand, four hundred twenty-one".