660408734993 has 8 divisors (see below), whose sum is σ = 756253346688. Its totient is φ = 564939249984.

The previous prime is 660408734983. The next prime is 660408735017. The reversal of 660408734993 is 399437804066.

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 660408734993 - 2²⁸ = 660140299537 is a prime.

It is a super-3 number, since 3×660408734993³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (660408734903) 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, 93777896 + ... + 93784937.

It is an arithmetic number, because the mean of its divisors is an integer number (94531668336).

Almost surely, 2^660408734993 is an apocalyptic number.

It is an amenable number.

660408734993 is a deficient number, since it is larger than the sum of its proper divisors (95844611695).

660408734993 is a wasteful number, since it uses less digits than its factorization.

660408734993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187563343.

The product of its (nonzero) digits is 23514624, while the sum is 59.

The spelling of 660408734993 in words is "six hundred sixty billion, four hundred eight million, seven hundred thirty-four thousand, nine hundred ninety-three".