2045645994 has 64 divisors (see below), whose sum is σ = 4772275200. Its totient is φ = 572479488.

The previous prime is 2045645983. The next prime is 2045646007. The reversal of 2045645994 is 4995465402.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 759402 + ... + 762090.

It is an arithmetic number, because the mean of its divisors is an integer number (74566800).

Almost surely, 2^2045645994 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2045645994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2386137600).

2045645994 is an abundant number, since it is smaller than the sum of its proper divisors (2726629206).

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

2045645994 is a wasteful number, since it uses less digits than its factorization.

2045645994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3067.

The product of its (nonzero) digits is 1555200, while the sum is 48.

The square root of 2045645994 is about 45228.8181804477. The cubic root of 2045645994 is about 1269.4340988388.

The spelling of 2045645994 in words is "two billion, forty-five million, six hundred forty-five thousand, nine hundred ninety-four".