2664443945 has 8 divisors (see below), whose sum is σ = 3199036680. Its totient is φ = 2130419200.

The previous prime is 2664443941. The next prime is 2664443987. The reversal of 2664443945 is 5493444662.

It can be written as a sum of positive squares in 4 ways, for example, as 70375321 + 2594068624 = 8389^2 + 50932^2 .

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

It is not a de Polignac number, because 2664443945 - 2² = 2664443941 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2664443945.

It is not an unprimeable number, because it can be changed into a prime (2664443941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131606 + ... + 150495.

It is an arithmetic number, because the mean of its divisors is an integer number (399879585).

Almost surely, 2^2664443945 is an apocalyptic number.

It is an amenable number.

2664443945 is a deficient number, since it is larger than the sum of its proper divisors (534592735).

2664443945 is a wasteful number, since it uses less digits than its factorization.

2664443945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283995.

The product of its digits is 2488320, while the sum is 47.

The square root of 2664443945 is about 51618.2520529318. The cubic root of 2664443945 is about 1386.3371543215.

The spelling of 2664443945 in words is "two billion, six hundred sixty-four million, four hundred forty-three thousand, nine hundred forty-five".