1645170745 has 8 divisors (see below), whose sum is σ = 1976335560. Its totient is φ = 1314716160.

The previous prime is 1645170739. The next prime is 1645170773. The reversal of 1645170745 is 5470715461.

It can be written as a sum of positive squares in 4 ways, for example, as 120033936 + 1525136809 = 10956^2 + 39053^2 .

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

It is not a de Polignac number, because 1645170745 - 2⁷ = 1645170617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1645170698 and 1645170707.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172446 + ... + 181735.

It is an arithmetic number, because the mean of its divisors is an integer number (247041945).

Almost surely, 2^1645170745 is an apocalyptic number.

It is an amenable number.

1645170745 is a deficient number, since it is larger than the sum of its proper divisors (331164815).

1645170745 is an equidigital number, since it uses as much as digits as its factorization.

1645170745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355115.

The product of its (nonzero) digits is 117600, while the sum is 40.

The square root of 1645170745 is about 40560.7044440799. The cubic root of 1645170745 is about 1180.5117824535.

The spelling of 1645170745 in words is "one billion, six hundred forty-five million, one hundred seventy thousand, seven hundred forty-five".