1645045145 has 8 divisors (see below), whose sum is σ = 2001096456. Its totient is φ = 1298007936.

The previous prime is 1645045121. The next prime is 1645045153. The reversal of 1645045145 is 5415405461.

1645045145 is digitally balanced in base 6, 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 327935881 + 1317109264 = 18109^2 + 36292^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1645045145 is a prime.

It is a Duffinian number.

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, 2253122 + ... + 2253851.

It is an arithmetic number, because the mean of its divisors is an integer number (250137057).

Almost surely, 2^1645045145 is an apocalyptic number.

It is an amenable number.

1645045145 is a deficient number, since it is larger than the sum of its proper divisors (356051311).

1645045145 is an equidigital number, since it uses as much as digits as its factorization.

1645045145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4507051.

The product of its (nonzero) digits is 48000, while the sum is 35.

The square root of 1645045145 is about 40559.1561179470. The cubic root of 1645045145 is about 1180.4817397656.

The spelling of 1645045145 in words is "one billion, six hundred forty-five million, forty-five thousand, one hundred forty-five".