64659421 has 4 divisors (see below), whose sum is σ = 64998144. Its totient is φ = 64320700.

The previous prime is 64659409. The next prime is 64659431. The reversal of 64659421 is 12495646.

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 a cyclic number.

It is not a de Polignac number, because 64659421 - 2⁵ = 64659389 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 (64659431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169075 + ... + 169456.

It is an arithmetic number, because the mean of its divisors is an integer number (16249536).

Almost surely, 2^64659421 is an apocalyptic number.

It is an amenable number.

64659421 is a deficient number, since it is larger than the sum of its proper divisors (338723).

64659421 is a wasteful number, since it uses less digits than its factorization.

64659421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338722.

The product of its digits is 51840, while the sum is 37.

The square root of 64659421 is about 8041.1081947702. The cubic root of 64659421 is about 401.3691023008.

The spelling of 64659421 in words is "sixty-four million, six hundred fifty-nine thousand, four hundred twenty-one".