2644642066 has 24 divisors (see below), whose sum is σ = 4510750860. Its totient is φ = 1160654880.

The previous prime is 2644642001. The next prime is 2644642087. The reversal of 2644642066 is 6602464462.

It can be written as a sum of positive squares in 2 ways, for example, as 2599470225 + 45171841 = 50985^2 + 6721^2 .

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, 181401 + ... + 195436.

Almost surely, 2^2644642066 is an apocalyptic number.

2644642066 is a deficient number, since it is larger than the sum of its proper divisors (1866108794).

2644642066 is a wasteful number, since it uses less digits than its factorization.

2644642066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376890 (or 376879 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 40.

The square root of 2644642066 is about 51426.0835179970. The cubic root of 2644642066 is about 1382.8942383546.

The spelling of 2644642066 in words is "two billion, six hundred forty-four million, six hundred forty-two thousand, sixty-six".