646605475253 has 4 divisors (see below), whose sum is σ = 647611083168. Its totient is φ = 645599867340.

The previous prime is 646605475249. The next prime is 646605475267. The reversal of 646605475253 is 352574506646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 646605475253 - 2² = 646605475249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 646605475195 and 646605475204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646605075253) 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 3 ways as a sum of consecutive naturals, for example, 502802993 + ... + 502804278.

It is an arithmetic number, because the mean of its divisors is an integer number (161902770792).

Almost surely, 2^646605475253 is an apocalyptic number.

It is an amenable number.

646605475253 is a deficient number, since it is larger than the sum of its proper divisors (1005607915).

646605475253 is a wasteful number, since it uses less digits than its factorization.

646605475253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005607914.

The product of its (nonzero) digits is 18144000, while the sum is 53.

The spelling of 646605475253 in words is "six hundred forty-six billion, six hundred five million, four hundred seventy-five thousand, two hundred fifty-three".