64530661 has 4 divisors (see below), whose sum is σ = 69494572. Its totient is φ = 59566752.

The previous prime is 64530649. The next prime is 64530667. The reversal of 64530661 is 16603546.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5317636 + 59213025 = 2306^2 + 7695^2 .

It is a cyclic number.

It is not a de Polignac number, because 64530661 - 2⁵ = 64530629 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 (64530667) 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, 2481936 + ... + 2481961.

It is an arithmetic number, because the mean of its divisors is an integer number (17373643).

Almost surely, 2^64530661 is an apocalyptic number.

It is an amenable number.

64530661 is a deficient number, since it is larger than the sum of its proper divisors (4963911).

64530661 is a wasteful number, since it uses less digits than its factorization.

64530661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4963910.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 64530661 is about 8033.0978457878. The cubic root of 64530661 is about 401.1025021805.

The spelling of 64530661 in words is "sixty-four million, five hundred thirty thousand, six hundred sixty-one".