1645378330 has 8 divisors (see below), whose sum is σ = 2961681012. Its totient is φ = 658151328.

The previous prime is 1645378297. The next prime is 1645378349. The reversal of 1645378330 is 338735461.

It can be written as a sum of positive squares in 2 ways, for example, as 1609534161 + 35844169 = 40119^2 + 5987^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82268907 + ... + 82268926.

Almost surely, 2^1645378330 is an apocalyptic number.

1645378330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1645378330 is a deficient number, since it is larger than the sum of its proper divisors (1316302682).

1645378330 is a wasteful number, since it uses less digits than its factorization.

1645378330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164537840.

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 1645378330 is about 40563.2633056070. The cubic root of 1645378330 is about 1180.5614320583.

The spelling of 1645378330 in words is "one billion, six hundred forty-five million, three hundred seventy-eight thousand, three hundred thirty".