664421327001 has 12 divisors (see below), whose sum is σ = 959789818260. Its totient is φ = 442915186560.

The previous prime is 664421326999. The next prime is 664421327027. The reversal of 664421327001 is 100723124466.

664421327001 is a `hidden beast` number, since 6 + 644 + 2 + 1 + 3 + 2 + 7 + 0 + 0 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 146811585600 + 517609741401 = 383160^2 + 719451^2 .

It is not a de Polignac number, because 664421327001 - 2¹ = 664421326999 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (664421327071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2566716 + ... + 2813693.

It is an arithmetic number, because the mean of its divisors is an integer number (79982484855).

Almost surely, 2^664421327001 is an apocalyptic number.

It is an amenable number.

664421327001 is a deficient number, since it is larger than the sum of its proper divisors (295368491259).

664421327001 is a wasteful number, since it uses less digits than its factorization.

664421327001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5394136 (or 5394133 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The spelling of 664421327001 in words is "six hundred sixty-four billion, four hundred twenty-one million, three hundred twenty-seven thousand, one".