65421607 has 4 divisors (see below), whose sum is σ = 65665080. Its totient is φ = 65178136.

The previous prime is 65421571. The next prime is 65421611. The reversal of 65421607 is 70612456.

It is a happy number.

65421607 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.

It is a cyclic number.

It is not a de Polignac number, because 65421607 - 2⁷ = 65421479 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65421677) 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, 121333 + ... + 121870.

It is an arithmetic number, because the mean of its divisors is an integer number (16416270).

Almost surely, 2^65421607 is an apocalyptic number.

65421607 is a deficient number, since it is larger than the sum of its proper divisors (243473).

65421607 is a wasteful number, since it uses less digits than its factorization.

65421607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243472.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 65421607 is about 8088.3624424231. The cubic root of 65421607 is about 402.9400190272.

The spelling of 65421607 in words is "sixty-five million, four hundred twenty-one thousand, six hundred seven".