664821015144 has 128 divisors (see below), whose sum is σ = 2037517977600. Its totient is φ = 177878511360.

The previous prime is 664821015137. The next prime is 664821015149. The reversal of 664821015144 is 441510128466.

It is a super-3 number, since 3×664821015144³ (a number of 36 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 664821015096 and 664821015105.

It is not an unprimeable number, because it can be changed into a prime (664821015149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4132204 + ... + 4290075.

It is an arithmetic number, because the mean of its divisors is an integer number (15918109200).

Almost surely, 2^664821015144 is an apocalyptic number.

It is an amenable number.

664821015144 is an abundant number, since it is smaller than the sum of its proper divisors (1372696962456).

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

664821015144 is a wasteful number, since it uses less digits than its factorization.

664821015144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8422335 (or 8422331 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 42.

The spelling of 664821015144 in words is "six hundred sixty-four billion, eight hundred twenty-one million, fifteen thousand, one hundred forty-four".