645063550545 has 16 divisors (see below), whose sum is σ = 1032321249792. Its totient is φ = 343960704000.

The previous prime is 645063550543. The next prime is 645063550577. The reversal of 645063550545 is 545055360546.

It is not a de Polignac number, because 645063550545 - 2¹ = 645063550543 is a prime.

It is a super-2 number, since 2×645063550545² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645063550494 and 645063550503.

It is not an unprimeable number, because it can be changed into a prime (645063550543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4501456 + ... + 4642545.

It is an arithmetic number, because the mean of its divisors is an integer number (64520078112).

Almost surely, 2^645063550545 is an apocalyptic number.

It is an amenable number.

645063550545 is a deficient number, since it is larger than the sum of its proper divisors (387257699247).

645063550545 is a wasteful number, since it uses less digits than its factorization.

645063550545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9148712.

The product of its (nonzero) digits is 5400000, while the sum is 48.

The spelling of 645063550545 in words is "six hundred forty-five billion, sixty-three million, five hundred fifty thousand, five hundred forty-five".