664202603561644 has 24 divisors (see below), whose sum is σ = 1330252780469760. Its totient is φ = 284262350095056.

The previous prime is 664202603561641. The next prime is 664202603561689. The reversal of 664202603561644 is 446165306202466.

It is a super-3 number, since 3×664202603561644³ (a number of 45 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (664202603561641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16496170102 + ... + 16496210365.

It is an arithmetic number, because the mean of its divisors is an integer number (55427199186240).

Almost surely, 2^{664202603561644} is an apocalyptic number.

It is an amenable number.

664202603561644 is an abundant number, since it is smaller than the sum of its proper divisors (666050176908116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664202603561644 is a wasteful number, since it uses less digits than its factorization.

664202603561644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32992381197 (or 32992381195 counting only the distinct ones).

The product of its (nonzero) digits is 29859840, while the sum is 55.

The spelling of 664202603561644 in words is "six hundred sixty-four trillion, two hundred two billion, six hundred three million, five hundred sixty-one thousand, six hundred forty-four".