664583441581 has 8 divisors (see below), whose sum is σ = 666203186880. Its totient is φ = 662963857248.

The previous prime is 664583441551. The next prime is 664583441651. The reversal of 664583441581 is 185144385466.

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 664583441581 - 2¹³ = 664583433389 is a prime.

It is a super-2 number, since 2×664583441581² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664583441531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15052320 + ... + 15096406.

It is an arithmetic number, because the mean of its divisors is an integer number (83275398360).

Almost surely, 2^664583441581 is an apocalyptic number.

It is an amenable number.

664583441581 is a deficient number, since it is larger than the sum of its proper divisors (1619745299).

664583441581 is a wasteful number, since it uses less digits than its factorization.

664583441581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80483.

The product of its digits is 11059200, while the sum is 55.

The spelling of 664583441581 in words is "six hundred sixty-four billion, five hundred eighty-three million, four hundred forty-one thousand, five hundred eighty-one".