1645804642194 has 24 divisors (see below), whose sum is σ = 3566113709340. Its totient is φ = 548570216448.

The previous prime is 1645804642171. The next prime is 1645804642247. The reversal of 1645804642194 is 4912464085461.

1645804642194 is a `hidden beast` number, since 1 + 6 + 4 + 580 + 4 + 6 + 42 + 19 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1641076292025 + 4728350169 = 1281045^2 + 68763^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1645804642194.

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, 2285887 + ... + 2918370.

Almost surely, 2^{1645804642194} is an apocalyptic number.

1645804642194 is an abundant number, since it is smaller than the sum of its proper divisors (1920309067146).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1645804642194 is a wasteful number, since it uses less digits than its factorization.

1645804642194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5221834 (or 5221831 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 54.

The spelling of 1645804642194 in words is "one trillion, six hundred forty-five billion, eight hundred four million, six hundred forty-two thousand, one hundred ninety-four".