664657785453 has 8 divisors (see below), whose sum is σ = 894984741216. Its totient is φ = 438718010000.

The previous prime is 664657785437. The next prime is 664657785497. The reversal of 664657785453 is 354587756466.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 664657785453 - 2⁴ = 664657785437 is a prime.

It is a super-3 number, since 3×664657785453³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664657715453) 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 7 ways as a sum of consecutive naturals, for example, 1096794723 + ... + 1096795328.

It is an arithmetic number, because the mean of its divisors is an integer number (111873092652).

Almost surely, 2^664657785453 is an apocalyptic number.

It is an amenable number.

664657785453 is a deficient number, since it is larger than the sum of its proper divisors (230326955763).

664657785453 is a wasteful number, since it uses less digits than its factorization.

664657785453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2193590155.

The product of its digits is 508032000, while the sum is 66.

The spelling of 664657785453 in words is "six hundred sixty-four billion, six hundred fifty-seven million, seven hundred eighty-five thousand, four hundred fifty-three".