64333561 has 4 divisors (see below), whose sum is σ = 65056500. Its totient is φ = 63610624.

The previous prime is 64333537. The next prime is 64333567. The reversal of 64333561 is 16533346.

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 33419961 + 30913600 = 5781^2 + 5560^2 .

It is a cyclic number.

It is not a de Polignac number, because 64333561 - 2⁷ = 64333433 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (64333567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 361336 + ... + 361513.

It is an arithmetic number, because the mean of its divisors is an integer number (16264125).

Almost surely, 2^64333561 is an apocalyptic number.

It is an amenable number.

64333561 is a deficient number, since it is larger than the sum of its proper divisors (722939).

64333561 is an equidigital number, since it uses as much as digits as its factorization.

64333561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722938.

The product of its digits is 19440, while the sum is 31.

The square root of 64333561 is about 8020.8204692538. The cubic root of 64333561 is about 400.6937149534.

The spelling of 64333561 in words is "sixty-four million, three hundred thirty-three thousand, five hundred sixty-one".