564064661 has 4 divisors (see below), whose sum is σ = 571204800. Its totient is φ = 556924524.

The previous prime is 564064651. The next prime is 564064663. The reversal of 564064661 is 166460465.

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, and also an emirpimes, since its reverse is a distinct semiprime: 166460465 = 5 ⋅33292093.

It is a cyclic number.

It is not a de Polignac number, because 564064661 - 2²² = 559870357 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 (564064663) 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, 3569951 + ... + 3570108.

It is an arithmetic number, because the mean of its divisors is an integer number (142801200).

Almost surely, 2^564064661 is an apocalyptic number.

It is an amenable number.

564064661 is a deficient number, since it is larger than the sum of its proper divisors (7140139).

564064661 is an equidigital number, since it uses as much as digits as its factorization.

564064661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7140138.

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

The square root of 564064661 is about 23750.0454946933. The cubic root of 564064661 is about 826.2464957590.

The spelling of 564064661 in words is "five hundred sixty-four million, sixty-four thousand, six hundred sixty-one".