64566641 has 4 divisors (see below), whose sum is σ = 64584000. Its totient is φ = 64549284.

The previous prime is 64566611. The next prime is 64566653. The reversal of 64566641 is 14666546.

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 64566641 - 2¹⁴ = 64550257 is a prime.

It is a super-2 number, since 2×64566641² = 8337702260045762, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 64566595 and 64566604.

It is not an unprimeable number, because it can be changed into a prime (64566611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 581 + ... + 11378.

It is an arithmetic number, because the mean of its divisors is an integer number (16146000).

Almost surely, 2^64566641 is an apocalyptic number.

It is an amenable number.

64566641 is a deficient number, since it is larger than the sum of its proper divisors (17359).

64566641 is a wasteful number, since it uses less digits than its factorization.

64566641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17358.

The product of its digits is 103680, while the sum is 38.

The square root of 64566641 is about 8035.3370184455. The cubic root of 64566641 is about 401.1770351567.

The spelling of 64566641 in words is "sixty-four million, five hundred sixty-six thousand, six hundred forty-one".