64008561 has 4 divisors (see below), whose sum is σ = 85344752. Its totient is φ = 42672372.

The previous prime is 64008551. The next prime is 64008599. The reversal of 64008561 is 16580046.

64008561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is not a de Polignac number, because 64008561 - 2⁷ = 64008433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64008551) 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 3 ways as a sum of consecutive naturals, for example, 10668091 + ... + 10668096.

It is an arithmetic number, because the mean of its divisors is an integer number (21336188).

Almost surely, 2^64008561 is an apocalyptic number.

It is an amenable number.

64008561 is a deficient number, since it is larger than the sum of its proper divisors (21336191).

64008561 is a wasteful number, since it uses less digits than its factorization.

64008561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21336190.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 64008561 is about 8000.5350446080. The cubic root of 64008561 is about 400.0178346215.

It can be divided in two parts, 640085 and 61, that added together give a triangular number (640146 = T₁₁₃₁).

The spelling of 64008561 in words is "sixty-four million, eight thousand, five hundred sixty-one".