664462402640 has 80 divisors (see below), whose sum is σ = 1612262880000. Its totient is φ = 254194507776.

The previous prime is 664462402613. The next prime is 664462402651. The reversal of 664462402640 is 46204264466.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-3 number, since 3×664462402640³ (a number of 36 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 664462402591 and 664462402600.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 16538096 + ... + 16578224.

It is an arithmetic number, because the mean of its divisors is an integer number (20153286000).

Almost surely, 2^664462402640 is an apocalyptic number.

It is an amenable number.

664462402640 is an abundant number, since it is smaller than the sum of its proper divisors (947800477360).

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

664462402640 is a wasteful number, since it uses less digits than its factorization.

664462402640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49164 (or 49158 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 44.

The spelling of 664462402640 in words is "six hundred sixty-four billion, four hundred sixty-two million, four hundred two thousand, six hundred forty".