664447074798481 has 32 divisors (see below), whose sum is σ = 735182942860800. Its totient is φ = 600224208854400.

The previous prime is 664447074798449. The next prime is 664447074798503. The reversal of 664447074798481 is 184897470744466.

It is not a de Polignac number, because 664447074798481 - 2⁵ = 664447074798449 is a prime.

It is a super-2 number, since 2×664447074798481² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664447074799481) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1016877805 + ... + 1017531013.

It is an arithmetic number, because the mean of its divisors is an integer number (22974466964400).

Almost surely, 2^{664447074798481} is an apocalyptic number.

It is an amenable number.

664447074798481 is a deficient number, since it is larger than the sum of its proper divisors (70735868062319).

664447074798481 is an equidigital number, since it uses as much as digits as its factorization.

664447074798481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663146 (or 663120 counting only the distinct ones).

The product of its (nonzero) digits is 7283146752, while the sum is 79.

The spelling of 664447074798481 in words is "six hundred sixty-four trillion, four hundred forty-seven billion, seventy-four million, seven hundred ninety-eight thousand, four hundred eighty-one".