645235006545 has 64 divisors (see below), whose sum is σ = 1215516637440. Its totient is φ = 323627572224.

The previous prime is 645235006531. The next prime is 645235006609. The reversal of 645235006545 is 545600532546.

645235006545 is a `hidden beast` number, since 6 + 4 + 52 + 3 + 50 + 0 + 6 + 545 = 666.

It is not a de Polignac number, because 645235006545 - 2⁴ = 645235006529 is a prime.

It is a super-2 number, since 2×645235006545² (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 self number, because there is not a number n which added to its sum of digits gives 645235006545.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2820634 + ... + 3040796.

It is an arithmetic number, because the mean of its divisors is an integer number (18992447460).

Almost surely, 2^645235006545 is an apocalyptic number.

It is an amenable number.

645235006545 is a deficient number, since it is larger than the sum of its proper divisors (570281630895).

645235006545 is a wasteful number, since it uses less digits than its factorization.

645235006545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221471 (or 221465 counting only the distinct ones).

The product of its (nonzero) digits is 2160000, while the sum is 45.

The spelling of 645235006545 in words is "six hundred forty-five billion, two hundred thirty-five million, six thousand, five hundred forty-five".