664562401 has 2 divisors, whose sum is σ = 664562402. Its totient is φ = 664562400.

The previous prime is 664562363. The next prime is 664562441. The reversal of 664562401 is 104265466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 560032225 + 104530176 = 23665^2 + 10224^2 .

It is a cyclic number.

It is not a de Polignac number, because 664562401 - 2⁷ = 664562273 is a prime.

It is not a weakly prime, because it can be changed into another prime (664562441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332281200 + 332281201.

It is an arithmetic number, because the mean of its divisors is an integer number (332281201).

Almost surely, 2^664562401 is an apocalyptic number.

It is an amenable number.

664562401 is a deficient number, since it is larger than the sum of its proper divisors (1).

664562401 is an equidigital number, since it uses as much as digits as its factorization.

664562401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 664562401 is about 25779.1078394889. The cubic root of 664562401 is about 872.6603733083.

The spelling of 664562401 in words is "six hundred sixty-four million, five hundred sixty-two thousand, four hundred one".