664841554001 has 2 divisors, whose sum is σ = 664841554002. Its totient is φ = 664841554000.

The previous prime is 664841553997. The next prime is 664841554021. The reversal of 664841554001 is 100455148466.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 621260816401 + 43580737600 = 788201^2 + 208760^2 .

It is a cyclic number.

It is not a de Polignac number, because 664841554001 - 2² = 664841553997 is a prime.

It is not a weakly prime, because it can be changed into another prime (664841554021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332420777000 + 332420777001.

It is an arithmetic number, because the mean of its divisors is an integer number (332420777001).

Almost surely, 2^664841554001 is an apocalyptic number.

It is an amenable number.

664841554001 is a deficient number, since it is larger than the sum of its proper divisors (1).

664841554001 is an equidigital number, since it uses as much as digits as its factorization.

664841554001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 460800, while the sum is 44.

The spelling of 664841554001 in words is "six hundred sixty-four billion, eight hundred forty-one million, five hundred fifty-four thousand, one".