2001964645 has 4 divisors (see below), whose sum is σ = 2402357580. Its totient is φ = 1601571712.

The previous prime is 2001964639. The next prime is 2001964649. The reversal of 2001964645 is 5464691002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1099983556 + 901981089 = 33166^2 + 30033^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001964645 - 2¹⁷ = 2001833573 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001964649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200196460 + ... + 200196469.

It is an arithmetic number, because the mean of its divisors is an integer number (600589395).

Almost surely, 2^2001964645 is an apocalyptic number.

It is an amenable number.

2001964645 is a deficient number, since it is larger than the sum of its proper divisors (400392935).

2001964645 is an equidigital number, since it uses as much as digits as its factorization.

2001964645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400392934.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 2001964645 is about 44743.3195572255. The cubic root of 2001964645 is about 1260.3334644815. Note that the first 3 decimals are identical.

The spelling of 2001964645 in words is "two billion, one million, nine hundred sixty-four thousand, six hundred forty-five".