2641943945 has 4 divisors (see below), whose sum is σ = 3170332740. Its totient is φ = 2113555152.

The previous prime is 2641943903. The next prime is 2641943959. The reversal of 2641943945 is 5493491462.

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 558660496 + 2083283449 = 23636^2 + 45643^2 .

It is a cyclic number.

It is not a de Polignac number, because 2641943945 - 2⁶ = 2641943881 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2641943945.

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, 264194390 + ... + 264194399.

It is an arithmetic number, because the mean of its divisors is an integer number (792583185).

Almost surely, 2^2641943945 is an apocalyptic number.

It is an amenable number.

2641943945 is a deficient number, since it is larger than the sum of its proper divisors (528388795).

2641943945 is an equidigital number, since it uses as much as digits as its factorization.

2641943945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528388794.

The product of its digits is 933120, while the sum is 47.

The square root of 2641943945 is about 51399.8438227199. The cubic root of 2641943945 is about 1382.4237921340.

The spelling of 2641943945 in words is "two billion, six hundred forty-one million, nine hundred forty-three thousand, nine hundred forty-five".