645413545 has 12 divisors (see below), whose sum is σ = 900944964. Its totient is φ = 442569120.

The previous prime is 645413537. The next prime is 645413569. The reversal of 645413545 is 545314546.

645413545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 161061481 + 484352064 = 12691^2 + 22008^2 .

It is not a de Polignac number, because 645413545 - 2³ = 645413537 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1316926 + ... + 1317415.

It is an arithmetic number, because the mean of its divisors is an integer number (75078747).

Almost surely, 2^645413545 is an apocalyptic number.

It is an amenable number.

645413545 is a deficient number, since it is larger than the sum of its proper divisors (255531419).

645413545 is a wasteful number, since it uses less digits than its factorization.

645413545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2634360 (or 2634353 counting only the distinct ones).

The product of its digits is 144000, while the sum is 37.

The square root of 645413545 is about 25404.9905530390. The cubic root of 645413545 is about 864.1968755923.

It can be divided in two parts, 64541 and 3545, that added together give a palindrome (68086).

The spelling of 645413545 in words is "six hundred forty-five million, four hundred thirteen thousand, five hundred forty-five".