646660516653453 has 8 divisors (see below), whose sum is σ = 864262036510816. Its totient is φ = 430083003949200.

The previous prime is 646660516653367. The next prime is 646660516653577. The reversal of 646660516653453 is 354356615066646.

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

It is not a de Polignac number, because 646660516653453 - 2²⁰ = 646660515604877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646660512653453) 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, 256001786803 + ... + 256001789328.

It is an arithmetic number, because the mean of its divisors is an integer number (108032754563852).

Almost surely, 2^{646660516653453} is an apocalyptic number.

It is an amenable number.

646660516653453 is a deficient number, since it is larger than the sum of its proper divisors (217601519857363).

646660516653453 is a wasteful number, since it uses less digits than its factorization.

646660516653453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512003576555.

The product of its (nonzero) digits is 839808000, while the sum is 66.

The spelling of 646660516653453 in words is "six hundred forty-six trillion, six hundred sixty billion, five hundred sixteen million, six hundred fifty-three thousand, four hundred fifty-three".