664583644081 has 8 divisors (see below), whose sum is σ = 792546954624. Its totient is φ = 544876031040.

The previous prime is 664583644079. The next prime is 664583644117. The reversal of 664583644081 is 180446385466.

It is a happy number.

664583644081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 664583644081 - 2¹ = 664583644079 is a prime.

It is a super-2 number, since 2×664583644081² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664583644981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2063924200 + ... + 2063924521.

It is an arithmetic number, because the mean of its divisors is an integer number (99068369328).

Almost surely, 2^664583644081 is an apocalyptic number.

It is an amenable number.

664583644081 is a deficient number, since it is larger than the sum of its proper divisors (127963310543).

664583644081 is a wasteful number, since it uses less digits than its factorization.

664583644081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4127848751.

The product of its (nonzero) digits is 13271040, while the sum is 55.

The spelling of 664583644081 in words is "six hundred sixty-four billion, five hundred eighty-three million, six hundred forty-four thousand, eighty-one".