664841535657 has 8 divisors (see below), whose sum is σ = 954644256384. Its totient is φ = 409133252688.

The previous prime is 664841535647. The next prime is 664841535671. The reversal of 664841535657 is 756535148466.

It is a happy number.

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

It is not a de Polignac number, because 664841535657 - 2⁶ = 664841535593 is a prime.

It is a super-3 number, since 3×664841535657³ (a number of 36 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 664841535657.

It is not an unprimeable number, because it can be changed into a prime (664841535637) 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, 8523609393 + ... + 8523609470.

It is an arithmetic number, because the mean of its divisors is an integer number (119330532048).

Almost surely, 2^664841535657 is an apocalyptic number.

It is an amenable number.

664841535657 is a deficient number, since it is larger than the sum of its proper divisors (289802720727).

664841535657 is a wasteful number, since it uses less digits than its factorization.

664841535657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17047218879.

The product of its digits is 72576000, while the sum is 60.

The spelling of 664841535657 in words is "six hundred sixty-four billion, eight hundred forty-one million, five hundred thirty-five thousand, six hundred fifty-seven".