64664511 has 4 divisors (see below), whose sum is σ = 86219352. Its totient is φ = 43109672.

The previous prime is 64664497. The next prime is 64664539. The reversal of 64664511 is 11546646.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64664511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64664591) 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, 10777416 + ... + 10777421.

It is an arithmetic number, because the mean of its divisors is an integer number (21554838).

Almost surely, 2^64664511 is an apocalyptic number.

64664511 is a deficient number, since it is larger than the sum of its proper divisors (21554841).

64664511 is a wasteful number, since it uses less digits than its factorization.

64664511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21554840.

The product of its digits is 17280, while the sum is 33.

The square root of 64664511 is about 8041.4246872056. The cubic root of 64664511 is about 401.3796339711.

The spelling of 64664511 in words is "sixty-four million, six hundred sixty-four thousand, five hundred eleven".