664589401 has 6 divisors (see below), whose sum is σ = 773093850. Its totient is φ = 569648016.

The previous prime is 664589399. The next prime is 664589411. The reversal of 664589401 is 104985466.

It can be written as a sum of positive squares in only one way, i.e., 650301001 + 14288400 = 25501^2 + 3780^2 .

It is not a de Polignac number, because 664589401 - 2¹ = 664589399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664589411) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6781476 + ... + 6781573.

It is an arithmetic number, because the mean of its divisors is an integer number (128848975).

Almost surely, 2^664589401 is an apocalyptic number.

It is an amenable number.

664589401 is a deficient number, since it is larger than the sum of its proper divisors (108504449).

664589401 is a wasteful number, since it uses less digits than its factorization.

664589401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13563063 (or 13563056 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 664589401 is about 25779.6315140461. The cubic root of 664589401 is about 872.6721913663.

The spelling of 664589401 in words is "six hundred sixty-four million, five hundred eighty-nine thousand, four hundred one".