645702545 has 8 divisors (see below), whose sum is σ = 801561960. Its totient is φ = 498749440.

The previous prime is 645702539. The next prime is 645702557. The reversal of 645702545 is 545207546.

645702545 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 4 ways, for example, as 85264 + 645617281 = 292^2 + 25409^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 645702545 - 2¹⁰ = 645701521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645702499 and 645702508.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2226416 + ... + 2226705.

It is an arithmetic number, because the mean of its divisors is an integer number (100195245).

Almost surely, 2^645702545 is an apocalyptic number.

It is an amenable number.

645702545 is a deficient number, since it is larger than the sum of its proper divisors (155859415).

645702545 is a wasteful number, since it uses less digits than its factorization.

645702545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4453155.

The product of its (nonzero) digits is 168000, while the sum is 38.

The square root of 645702545 is about 25410.6777752975. The cubic root of 645702545 is about 864.3258449074.

The spelling of 645702545 in words is "six hundred forty-five million, seven hundred two thousand, five hundred forty-five".