664435786480 has 40 divisors (see below), whose sum is σ = 1544855667552. Its totient is φ = 265767009024.

The previous prime is 664435786439. The next prime is 664435786489. The reversal of 664435786480 is 84687534466.

It is a happy number.

664435786480 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664435786489) 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, 3541597 + ... + 3724483.

Almost surely, 2^664435786480 is an apocalyptic number.

It is an amenable number.

664435786480 is an abundant number, since it is smaller than the sum of its proper divisors (880419881072).

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

664435786480 is a wasteful number, since it uses less digits than its factorization.

664435786480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228313 (or 228307 counting only the distinct ones).

The product of its (nonzero) digits is 92897280, while the sum is 61.

The spelling of 664435786480 in words is "six hundred sixty-four billion, four hundred thirty-five million, seven hundred eighty-six thousand, four hundred eighty".