2665443650 has 24 divisors (see below), whose sum is σ = 5128684020. Its totient is φ = 1029412160.

The previous prime is 2665443587. The next prime is 2665443653. The reversal of 2665443650 is 563445662.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 448634761 + 2216808889 = 21181^2 + 47083^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2665443598 and 2665443607.

It is not an unprimeable number, because it can be changed into a prime (2665443653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 917669 + ... + 920568.

Almost surely, 2^2665443650 is an apocalyptic number.

2665443650 is a deficient number, since it is larger than the sum of its proper divisors (2463240370).

2665443650 is a wasteful number, since it uses less digits than its factorization.

2665443650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1838278 (or 1838273 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 41.

The square root of 2665443650 is about 51627.9347834096. The cubic root of 2665443650 is about 1386.5105181847.

The spelling of 2665443650 in words is "two billion, six hundred sixty-five million, four hundred forty-three thousand, six hundred fifty".