64520661 has 8 divisors (see below), whose sum is σ = 91088064. Its totient is φ = 40483520.

The previous prime is 64520647. The next prime is 64520669. The reversal of 64520661 is 16602546.

64520661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64520661 - 2⁵ = 64520629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64520669) 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 7 ways as a sum of consecutive naturals, for example, 632505 + ... + 632606.

It is an arithmetic number, because the mean of its divisors is an integer number (11386008).

Almost surely, 2^64520661 is an apocalyptic number.

It is an amenable number.

64520661 is a deficient number, since it is larger than the sum of its proper divisors (26567403).

64520661 is a wasteful number, since it uses less digits than its factorization.

64520661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1265131.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 64520661 is about 8032.4753967877. The cubic root of 64520661 is about 401.0817821477.

The spelling of 64520661 in words is "sixty-four million, five hundred twenty thousand, six hundred sixty-one".