664335212080 has 40 divisors (see below), whose sum is σ = 1546758032400. Its totient is φ = 265359260928.

The previous prime is 664335212053. The next prime is 664335212089. The reversal of 664335212080 is 80212533466.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (664335212089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5799550 + ... + 5912989.

It is an arithmetic number, because the mean of its divisors is an integer number (38668950810).

Almost surely, 2^664335212080 is an apocalyptic number.

It is an amenable number.

664335212080 is an abundant number, since it is smaller than the sum of its proper divisors (882422820320).

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

664335212080 is a wasteful number, since it uses less digits than its factorization.

664335212080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11713261 (or 11713255 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 40.

The spelling of 664335212080 in words is "six hundred sixty-four billion, three hundred thirty-five million, two hundred twelve thousand, eighty".