645350053545 has 16 divisors (see below), whose sum is σ = 1147288984320. Its totient is φ = 344186695152.

The previous prime is 645350053463. The next prime is 645350053549. The reversal of 645350053545 is 545350053546.

645350053545 is a `hidden beast` number, since 6 + 4 + 5 + 3 + 50 + 0 + 53 + 545 = 666.

It is not a de Polignac number, because 645350053545 - 2¹⁴ = 645350037161 is a prime.

It is a super-2 number, since 2×645350053545² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 645350053545.

It is not an unprimeable number, because it can be changed into a prime (645350053549) 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 15 ways as a sum of consecutive naturals, for example, 2390185249 + ... + 2390185518.

It is an arithmetic number, because the mean of its divisors is an integer number (71705561520).

Almost surely, 2^645350053545 is an apocalyptic number.

It is an amenable number.

645350053545 is a deficient number, since it is larger than the sum of its proper divisors (501938930775).

645350053545 is a wasteful number, since it uses less digits than its factorization.

645350053545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4780370781 (or 4780370775 counting only the distinct ones).

The product of its (nonzero) digits is 2700000, while the sum is 45.

Subtracting from 645350053545 its reverse (545350053546), we obtain a palindrome (99999999999).

The spelling of 645350053545 in words is "six hundred forty-five billion, three hundred fifty million, fifty-three thousand, five hundred forty-five".