645250532205053 has 4 divisors (see below), whose sum is σ = 647199929583648. Its totient is φ = 643301134826460.

The previous prime is 645250532205031. The next prime is 645250532205121. The reversal of 645250532205053 is 350502235052546.

645250532205053 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 645250532205053 - 2¹⁸ = 645250531942909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645250532204989 and 645250532205007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645250532205353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 974698688801 + ... + 974698689462.

It is an arithmetic number, because the mean of its divisors is an integer number (161799982395912).

Almost surely, 2^{645250532205053} is an apocalyptic number.

It is an amenable number.

645250532205053 is a deficient number, since it is larger than the sum of its proper divisors (1949397378595).

645250532205053 is a wasteful number, since it uses less digits than its factorization.

645250532205053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1949397378594.

The product of its (nonzero) digits is 5400000, while the sum is 47.

Adding to 645250532205053 its reverse (350502235052546), we get a palindrome (995752767257599).

The spelling of 645250532205053 in words is "six hundred forty-five trillion, two hundred fifty billion, five hundred thirty-two million, two hundred five thousand, fifty-three".